CVE-2025-34291 (GCVE-0-2025-34291)

Vulnerability from cvelistv5 – Published: 2025-12-05 22:27 – Updated: 2026-07-14 22:25
VLAI CISA Previdian
Title
Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
Summary
Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.
Severity
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-21 00:00 UTC
CWE
  • CWE-346 - Origin Validation Error
Assigner
References
Impacted products
Vendor Product Version
Langflow Langflow Affected: 0 , ≤ 1.6.9 (semver)
    cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Fenix Qiao (aka 13ph03nix) from Obsidian Security Shuyang Wang from Obsidian Security
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 941d82ae-3dcb-4e00-85a7-f98a8d3c30e3

Vulnerability ID: CVE-2025-34291

Status: Confirmed

Status Updated: 2026-05-21 02:00 CEST

Exploited: Yes

Timestamps
First Seen: 2026-05-21
Asserted: 2026-05-21
Scope
Notes: Langflow Origin Validation Error Vulnerability | Affected: Langflow / Langflow | Description: Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-06-04 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/langflow-ai/langflow ; https://github.com/langflow-ai/langflow/releases/tag/v1.9.3; https://github.com/langflow-ai/langflow/issues/11465#event-25774545848 ; https://nvd.nist.gov/vuln/detail/CVE-2025-34291
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-346
Feed CISA Known Exploited Vulnerabilities Catalog
Product Langflow
Due Date 2026-06-04
Date Added 2026-05-21
Vendorproject Langflow
Vulnerabilityname Langflow Origin Validation Error Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-02 08:09 CEST | Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: dc642cda-5f00-4db2-ac56-59041e2debbe

Vulnerability ID: CVE-2025-34291

Status: Confirmed

Status Updated: 2026-06-01 15:29 CEST

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE | Affected: Langflow / Langflow | CVSS: 9.4 (CRITICAL) | EPSS: 0.92808 | Used in malware: unknown | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
Cve Id CVE-2025-34291
Vendor Langflow
Ghsa Id GHSA-577H-P2HH-V4MV
Product Langflow
Added Date 2026-06-01T13:29:30.499Z
Cvss Score 9.4
Epss Score 0.92808
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.99828
Used In Malware unknown
Vulnerability Id CVE-2025-34291
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-10-02 09:09 CEST | Updated: 2026-10-02 09:09 CEST
Show details on NVD website
To clipboard 

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              "value": "Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins=\u0027*\u0027 with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints \u2014 including built-in code-execution functionality \u2014 allowing the attacker to execute arbitrary code and achieve full system compromise."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-160",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-160 Exploit Script-Based APIs"
                }
              ]
            },
            {
              "capecId": "CAPEC-21",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-21 Exploitation of Trusted Identifiers"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 9.4,
                "baseSeverity": "CRITICAL",
                "exploitMaturity": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "HIGH",
                "subConfidentialityImpact": "HIGH",
                "subIntegrityImpact": "HIGH",
                "userInteraction": "PASSIVE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-346",
                  "description": "CWE-346 Origin Validation Error",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-14T22:25:54.449Z",
            "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
            "shortName": "VulnCheck"
          },
          "references": [
            {
              "tags": [
                "technical-description",
                "exploit"
              ],
              "url": "https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform"
            },
            {
              "tags": [
                "product"
              ],
              "url": "https://github.com/langflow-ai/langflow"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Langflow \u003c= 1.6.9 CORS Misconfiguration to Token Hijack \u0026 RCE",
          "x_generator": {
            "engine": "Vulnogram 0.4.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2025-34291",
        "datePublished": "2025-12-05T22:27:26.438Z",
        "dateReserved": "2025-04-15T19:15:22.581Z",
        "dateUpdated": "2026-07-14T22:25:54.449Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.