Mattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774
| Vendor | Product | Versions |
|---|---|---|
| mattermost | mattermost | 11.7.0 |
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Article references different Mattermost advisory (MMSA-2026-00759) with updated affected versions through 11.7.14 and corrected patch versions to 11.7.14, 11.10.4, and 11.11.3
Expanded affected versions to include 11.10.x series (up to 11.10.x) and added information-disclosure tag to clarify vulnerability classification
Initial creation
