GHSA-4276-cm8c-788h

Source

https://github.com/advisories/GHSA-4276-cm8c-788h

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-4276-cm8c-788h/GHSA-4276-cm8c-788h.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-4276-cm8c-788h

Aliases

CVE-2025-53971

Published

2025-08-21T09:30:21Z

Modified

2025-08-21T16:14:43.799172Z

Severity

3.8 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N CVSS Calculator

Summary

Mattermost Fails to Properly Validate Team Role Modification

Details

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.

Database specific

{
    "github_reviewed": true,
    "severity": "LOW",
    "cwe_ids": [
        "CWE-863"
    ],
    "github_reviewed_at": "2025-08-21T16:03:01Z",
    "nvd_published_at": "2025-08-21T08:15:30Z"
}

References

Affected packages

Go / github.com/mattermost/mattermost-server

Package

Name: github.com/mattermost/mattermost-server; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type: SEMVER
Events: Introduced

10.5.0

Fixed

10.5.9

Database specific

{
    "last_known_affected_version_range": "<= 10.5.8"
}

Go / github.com/mattermost/mattermost-server

Package

Name: github.com/mattermost/mattermost-server; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type: SEMVER
Events: Introduced

9.11.0

Fixed

9.11.18

Database specific

{
    "last_known_affected_version_range": "<= 9.11.17"
}

Go / github.com/mattermost/mattermost/server/v8

Package

Name: github.com/mattermost/mattermost/server/v8; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost/server/v8

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.0.0-20250721095846-c602a4a78e1f