Vulnerability-Lookup

GHSA-4PPJ-6CHV-5PGC

Vulnerability from github – Published: 2026-03-16 15:30 – Updated: 2026-03-19 19:25

Summary

Mattermost Microsoft Teams Plugin fails to properly mask sensitive configuration values

Details

Mattermost Plugins versions <=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606

Severity

7.6 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost-plugin-msteams"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.15.1-0.20260102165339-036c761bd3cb"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-2476"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-19T19:25:25Z",
    "nvd_published_at": "2026-03-16T14:19:30Z",
    "severity": "HIGH"
  },
  "details": "Mattermost Plugins versions \u003c=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606",
  "id": "GHSA-4ppj-6chv-5pgc",
  "modified": "2026-03-19T19:25:25Z",
  "published": "2026-03-16T15:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2476"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mattermost/mattermost-plugin-msteams/commit/036c761bd3cb9ece92c17f2b151dfa906cebdcf6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mattermost/mattermost-plugin-msteams"
    },
    {
      "type": "WEB",
      "url": "https://mattermost.com/security-updates"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mattermost Microsoft Teams Plugin fails to properly mask sensitive configuration values"
}

CVE-2026-2476 (GCVE-0-2026-2476)

Vulnerability from cvelistv5 – Published: 2026-03-16 11:11 – Updated: 2026-03-16 13:49

Title

MS Teams plugin sensitive config values not properly masked in support packets

Summary

Severity

7.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-16 13:42 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

Mattermost mitre root Scorecard

References

1 reference

URL	Tags
https://mattermost.com/security-updates	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Mattermost	Mattermost	Affected: 0 , ≤ 2.0.3 (semver) Unaffected: 2.3.1.0

Credits

Yash-Chakerverti

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-2476",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-16T13:42:55.950049Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-16T13:49:58.500Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Mattermost",
          "vendor": "Mattermost",
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              "lessThanOrEqual": "2.0.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.3.1.0"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Yash-Chakerverti"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mattermost Plugins versions \u003c=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N",
            "version": "3.1"
          },
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          "scenarios": [
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              "lang": "en",
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            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-16T11:11:07.387Z",
        "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "shortName": "Mattermost"
      },
      "references": [
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          "name": "MMSA-2026-00606",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mattermost.com/security-updates"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Update Mattermost Plugins to versions 2.3.1.0 or higher."
        }
      ],
      "source": {
        "advisory": "MMSA-2026-00606",
        "defect": [
          "https://mattermost.atlassian.net/browse/MM-67533"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "MS Teams plugin sensitive config values not properly masked in support packets",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "cveId": "CVE-2026-2476",
    "datePublished": "2026-03-16T11:11:07.387Z",
    "dateReserved": "2026-02-13T15:59:24.864Z",
    "dateUpdated": "2026-03-16T13:49:58.500Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-4PPJ-6CHV-5PGC

CVE-2026-2476 (GCVE-0-2026-2476)

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Nomenclature

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