CVE-2026-77136 (GCVE-0-2026-77136)

Vulnerability from cvelistv5 – Published: 2026-08-25 09:00 – Updated: 2026-08-25 14:07
VLAI Previdian
Title
Server-Side Template Injection in extension "powermail" (powermail)
Summary
The extension passes the raw value of a form field configured as "This field contains the name of the sender" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the sender_name field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild.
Severity
9.5 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 14:06 UTC
CWE
  • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
References
Impacted products
Vendor Product Version
TYPO3 Extension "powermail" Affected: 13.0.0 , < 13.2.1 (semver)
Affected: 11.0.0 , < 12.6.1 (semver)
Affected: 0 , < 10.9.3 (semver)
Create a notification for this product.
Date Public
2026-08-25 09:00
Credits
Antariksha Sharma Rémi Payette Office québécois de la langue française (OQLF) Centre gouvernemental de Cyberdéfense (CGCD) Marcus Schwemer
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8014b953-f51a-4bfd-9b38-5ea6b33e251f

Vulnerability ID: CVE-2026-77136

Status: Confirmed

Status Updated: 2026-08-25 11:10 CEST

Exploited: Yes

Timestamps
First Seen: 2026-08-25
Asserted: 2026-08-25
Scope
Notes: Server-Side Template Injection in extension "powermail" (powermail) | Affected: TYPO3 / Extension "powermail" | CVSS: 9.5 (CRITICAL) | EPSS: 0.00968 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Server-Side Template Injection in extension "powermail" (powermail)
Cve Id CVE-2026-77136
Vendor TYPO3
Ghsa Id GHSA-6956-F2GQ-2C74
Product Extension "powermail"
Added Date 2026-08-25T09:10:43.436Z
Cvss Score 9.5
Epss Score 0.00968
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.60477
Used In Malware unknown
Vulnerability Id CVE-2026-77136
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-10-02 09:09 CEST | Updated: 2026-10-02 09:09 CEST
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-77136",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-25T14:06:57.264463Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-25T14:07:07.220Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://packagist.org/",
          "defaultStatus": "unaffected",
          "packageName": "in2code/powermail",
          "product": "Extension \"powermail\"",
          "repo": "https://github.com/in2code-de/powermail",
          "vendor": "TYPO3",
          "versions": [
            {
              "lessThan": "13.2.1",
              "status": "affected",
              "version": "13.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "12.6.1",
              "status": "affected",
              "version": "11.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "10.9.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Antariksha Sharma"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "R\u00e9mi Payette"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Office qu\u00e9b\u00e9cois de la langue fran\u00e7aise (OQLF)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Centre gouvernemental de Cyberd\u00e9fense (CGCD)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Marcus Schwemer"
        }
      ],
      "datePublic": "2026-08-25T09:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "The extension passes the raw value of a form field configured as \"This field contains the name of the sender\" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the \u003ccode\u003esender_name\u003c/code\u003e field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild."
            }
          ],
          "value": "The extension passes the raw value of a form field configured as \"This field contains the name of the sender\" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the sender_name field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.5,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1336",
              "description": "CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T09:00:39.526Z",
        "orgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "shortName": "TYPO3"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://typo3.org/security/advisory/typo3-ext-sa-2026-022"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Server-Side Template Injection in extension \"powermail\" (powermail)",
      "x_generator": {
        "engine": "Vulnogram 1.0.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
    "assignerShortName": "TYPO3",
    "cveId": "CVE-2026-77136",
    "datePublished": "2026-08-25T09:00:39.526Z",
    "dateReserved": "2026-08-20T13:10:12.063Z",
    "dateUpdated": "2026-08-25T14:07:07.220Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-77136",
      "date": "2026-10-01",
      "epss": "0.00968",
      "percentile": "0.60477"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "collectionURL": "https://packagist.org/",
                "defaultStatus": "unaffected",
                "packageName": "in2code/powermail",
                "product": "Extension \"powermail\"",
                "repo": "https://github.com/in2code-de/powermail",
                "vendor": "TYPO3",
                "versions": [
                  {
                    "lessThan": "13.2.1",
                    "status": "affected",
                    "version": "13.0.0",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "12.6.1",
                    "status": "affected",
                    "version": "11.0.0",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "10.9.3",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The extension passes the raw value of a form field configured as \"This field contains the name of the sender\" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the sender_name field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild."
          },
          {
            "lang": "es",
            "value": "La extensi\u00f3n pasa el valor en bruto de un campo de formulario configurado como \u0027Este campo contiene el nombre del remitente\u0027 directamente a una Vista Fluid como fuente de plantilla, sin ninguna sanitizaci\u00f3n, y lo renderiza. Un usuario an\u00f3nimo, no autenticado, puede enviar sintaxis de plantilla Fluid en ese campo para ejecutar ViewHelpers Fluid arbitrarios, lo que lleva a la divulgaci\u00f3n de la configuraci\u00f3n del servidor, variables de entorno y c\u00f3digo fuente de la aplicaci\u00f3n, y potencialmente ejecuci\u00f3n remota de c\u00f3digo. La explotaci\u00f3n requiere solo que un campo de formulario est\u00e9 configurado como el campo sender_name, una configuraci\u00f3n com\u00fan y adyacente por defecto de Powermail. No se requiere autenticaci\u00f3n ni interacci\u00f3n del usuario m\u00e1s all\u00e1 de un env\u00edo de formulario normal. Se informa que esta vulnerabilidad est\u00e1 siendo explotada activamente en la naturaleza."
          }
        ],
        "id": "CVE-2026-77136",
        "lastModified": "2026-09-28T23:10:00.143",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 9.5,
                "baseSeverity": "CRITICAL",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "HIGH",
                "subConfidentialityImpact": "HIGH",
                "subIntegrityImpact": "HIGH",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-77136",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-25T14:06:57.264463Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-25T09:17:34.187",
        "references": [
          {
            "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
            "url": "https://typo3.org/security/advisory/typo3-ext-sa-2026-022"
          }
        ],
        "sourceIdentifier": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-1336"
              }
            ],
            "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-77136",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-25T14:06:57.264463Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-25T14:07:01.389Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://packagist.org/",
              "defaultStatus": "unaffected",
              "packageName": "in2code/powermail",
              "product": "Extension \"powermail\"",
              "repo": "https://github.com/in2code-de/powermail",
              "vendor": "TYPO3",
              "versions": [
                {
                  "lessThan": "13.2.1",
                  "status": "affected",
                  "version": "13.0.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "12.6.1",
                  "status": "affected",
                  "version": "11.0.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "10.9.3",
                  "status": "affected",
                  "version": "0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "Antariksha Sharma"
            },
            {
              "lang": "en",
              "type": "reporter",
              "value": "R\u00e9mi Payette"
            },
            {
              "lang": "en",
              "type": "reporter",
              "value": "Office qu\u00e9b\u00e9cois de la langue fran\u00e7aise (OQLF)"
            },
            {
              "lang": "en",
              "type": "reporter",
              "value": "Centre gouvernemental de Cyberd\u00e9fense (CGCD)"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Marcus Schwemer"
            }
          ],
          "datePublic": "2026-08-25T09:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "The extension passes the raw value of a form field configured as \"This field contains the name of the sender\" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the \u003ccode\u003esender_name\u003c/code\u003e field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild."
                }
              ],
              "value": "The extension passes the raw value of a form field configured as \"This field contains the name of the sender\" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the sender_name field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 9.5,
                "baseSeverity": "CRITICAL",
                "exploitMaturity": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "HIGH",
                "subConfidentialityImpact": "HIGH",
                "subIntegrityImpact": "HIGH",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-1336",
                  "description": "CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-25T09:00:39.526Z",
            "orgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
            "shortName": "TYPO3"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://typo3.org/security/advisory/typo3-ext-sa-2026-022"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Server-Side Template Injection in extension \"powermail\" (powermail)",
          "x_generator": {
            "engine": "Vulnogram 1.0.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "assignerShortName": "TYPO3",
        "cveId": "CVE-2026-77136",
        "datePublished": "2026-08-25T09:00:39.526Z",
        "dateReserved": "2026-08-20T13:10:12.063Z",
        "dateUpdated": "2026-08-25T14:07:07.220Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.