data/reports/GO-2026-6281.yaml

id: GO-2026-6281
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: 8.0.0-20260423180926-c021eeaff8f0
summary: |-
    Mattermost doesn't sanitize FileInfo.Name received from federated peers during
    shared channel file sync in github.com/mattermost/mattermost-server
cves:
    - CVE-2026-6961
ghsas:
    - GHSA-8qq9-cqj8-82w4
references:
    - advisory: https://github.com/advisories/GHSA-8qq9-cqj8-82w4
    - advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-6961
    - web: https://github.com/mattermost/mattermost/commit/61d68d2d6ee81a5919597d91c736c502d7156859
    - web: https://github.com/mattermost/mattermost/commit/a0056ed68d95f64d7c4586985e7b7f16b96b3bec
    - web: https://github.com/mattermost/mattermost/commit/a9f3868e1eee9ec61855cd7277f39937385efffd
    - web: https://github.com/mattermost/mattermost/commit/c021eeaff8f003034ab40f82c552cc26a710a8fd
    - web: https://github.com/mattermost/mattermost/commit/c896a63dc44c2f9c081a0a15bfddc4e6eb50e753
    - web: https://github.com/mattermost/mattermost/pull/36223
    - web: https://github.com/mattermost/mattermost/pull/36251
    - web: https://github.com/mattermost/mattermost/pull/36252
    - web: https://github.com/mattermost/mattermost/pull/36253
    - web: https://github.com/mattermost/mattermost/pull/36255
    - 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-8qq9-cqj8-82w4
    created: 2026-08-24T21:13:39.56039-04:00
review_status: UNREVIEWED