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Vendor Solution
Update Mattermost to versions 11.11.0, 11.10.1, 11.7.10, 11.9.2, 11.8.6 or higher.
Tracking
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No advisories yet.
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
|
Fri, 16 Oct 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Fri, 16 Oct 2026 07:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate the combination of guest and admin scheme roles which allows an authenticated attacker to escalate a guest account to team or channel admin via a crafted PUT request to the member roles API endpoint.. Mattermost Advisory ID: MMSA-2026-00752 | |
| Title | Mattermost guest account privilege escalation via member roles API | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
cvssV3_1
|
Subscriptions
No data.
Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-10-16T12:01:15.622Z
Reserved: 2026-07-31T23:37:44.233Z
Link: CVE-2026-18551
Updated: 2026-10-16T12:01:10.919Z
Status : Received
Published: 2026-10-16T07:17:12.260
Modified: 2026-10-16T12:16:38.767
Link: CVE-2026-18551
No data.
OpenCVE Enrichment
Updated: 2026-10-16T15:15:14Z