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x/vulndb: potential Go vuln in github.com/mattermost/mattermost-server/v6: GHSA-mqcj-8c2g-h97q #4122

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x/vulndb: potential Go vuln in github.com/mattermost/mattermost-server/v6: GHSA-mqcj-8c2g-h97q#4122
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@GoVulnBot
GoVulnBot
opened on Nov 14, 2025

Advisory GHSA-mqcj-8c2g-h97q references a vulnerability in the following Go modules:

Module
github.com/mattermost/mattermost-server
github.com/mattermost/mattermost-server/v5
github.com/mattermost/mattermost-server/v6

Description:
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API, which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint.

References:

Cross references:

See doc/quickstart.md for instructions on how to triage this report.

id: GO-ID-PENDING
modules:
    - module: github.com/mattermost/mattermost-server
      versions:
        - introduced: 10.5.0+incompatible
        - fixed: 10.5.12+incompatible
        - introduced: 10.11.0+incompatible
        - fixed: 10.11.4+incompatible
      non_go_versions:
        - fixed: 8.0.0-20250905150616-ba86dfc5876b
      vulnerable_at: 10.11.4-rc3+incompatible
    - module: github.com/mattermost/mattermost-server/v5
      non_go_versions:
        - fixed: 5.3.2-0.20250905150616-ba86dfc5876b
      vulnerable_at: 5.39.3
    - module: github.com/mattermost/mattermost-server/v6
      vulnerable_at: 6.7.2
summary: Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server
cves:
    - CVE-2025-11777
ghsas:
    - GHSA-mqcj-8c2g-h97q
references:
    - advisory: https://github.com/advisories/GHSA-mqcj-8c2g-h97q
    - advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-11777
    - fix: https://github.com/mattermost/mattermost/commit/98acefe911dd9de7edf47a7d825dd99f53141a52
    - fix: https://github.com/mattermost/mattermost/commit/ba86dfc5876b354b9d3c20ff45c08ca6f8426149
    - fix: https://github.com/mattermost/mattermost/commit/d72d437f1567ba0b639b6e4fd73bab06c51baab5
    - web: https://mattermost.com/security-updates
source:
    id: GHSA-mqcj-8c2g-h97q
    created: 2025-11-14T16:03:12.273885935Z
review_status: UNREVIEWED

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