Mattermost Missing Authentication for Critical Function
Published Jul 18, 2025 · Updated Oct 23, 2026 · Also known as GO-2025-3819, GHSA-7h34-9chr-58qh
Original summary
Normalized public record · Updated Oct 23, 2026
Mattermost Missing Authentication for Critical Function
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.
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-2025-3819, GHSA-7h34-9chr-58qh
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Jul 18, 2025 · Last refreshed Oct 23, 2026