CVE-2026-91181 Affecting mattermost-10.11-compat package, versions <10.11.23-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-MATTERMOST1011COMPAT-20656193
- published9 Oct 2026
- disclosed14 Sept 2026
Introduced: 14 Sep 2026
CVE-2026-91181 (opens in a new tab)How to fix?
Upgrade Minimos:latest mattermost-10.11-compat to version 10.11.23-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mattermost-10.11-compat package and not the mattermost-10.11-compat package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team's secret invite_id and email, and use it to join the team without authorization, via GET /api/v4/data_retention/policies/{policy_id}/teams.. Mattermost Advisory ID: MMSA-2026-00702