data/reports/GO-2026-6285.yaml

id: GO-2026-6285
modules:
    - module: github.com/mattermost/mattermost-server
      versions:
        - introduced: 10.11.0+incompatible
        - fixed: 10.11.17+incompatible
        - introduced: 11.5.0+incompatible
        - fixed: 11.5.5+incompatible
        - introduced: 11.6.0+incompatible
        - fixed: 11.6.1+incompatible
      vulnerable_at: 11.6.1-rc1+incompatible
    - module: github.com/mattermost/mattermost-server/v5
      vulnerable_at: 5.39.3
    - module: github.com/mattermost/mattermost-server/v6
      vulnerable_at: 6.7.2
    - module: github.com/mattermost/mattermost/server/v8
      versions:
        - introduced: 8.0.0-20250731163400-5b955468ea1e
        - fixed: 8.0.0-20260501142004-99b73d4c4acf
summary: |-
    Mattermost doesn't require system-level permission when patching protected
    default system roles in github.com/mattermost/mattermost-server
cves:
    - CVE-2026-6739
ghsas:
    - GHSA-m2w9-h2mm-79qr
references:
    - advisory: https://github.com/advisories/GHSA-m2w9-h2mm-79qr
    - advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-6739
    - web: https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8
    - web: https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540
    - web: https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbae
    - web: https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7
    - web: https://github.com/mattermost/mattermost/pull/36197
    - web: https://github.com/mattermost/mattermost/pull/36377
    - web: https://github.com/mattermost/mattermost/pull/36379
    - web: https://github.com/mattermost/mattermost/pull/36380
    - web: https://github.com/mattermost/mattermost/pull/36382
    - web: https://github.com/mattermost/mattermost/releases/tag/v10.11.16
    - web: https://github.com/mattermost/mattermost/releases/tag/v11.5.5
    - web: https://github.com/mattermost/mattermost/releases/tag/v11.6.2
    - web: https://github.com/mattermost/mattermost/releases/tag/v11.7.0
    - web: https://mattermost.com/security-updates
notes:
    - fix: 'github.com/mattermost/mattermost/server/v8: could not add vulnerable_at: could not find tagged version between introduced and fixed'
source:
    id: GHSA-m2w9-h2mm-79qr
    created: 2026-08-24T21:12:54.88112-04:00
review_status: UNREVIEWED