Mattermost has a Missing Authorization vulnerability
Published Oct 16, 2025 · Updated Oct 24, 2026 · Also known as GO-2025-4031, GHSA-7cr3-38jm-6p45
Original summary
Normalized public record · Updated Oct 24, 2026
Mattermost has a Missing Authorization vulnerability
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- GO-2025-4031, GHSA-7cr3-38jm-6p45
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Oct 16, 2025 · Last refreshed Oct 24, 2026