MEDIUM 6.3 NVD

CVE-2026-10527

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to reconcile SchemeAdmin flags with a user's current role which allows a user

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to reconcile SchemeAdmin flags with a user's current role which allows a user demoted to System Guest to retain Board Admin privileges and perform admin-only operations via the Boards REST API or UI.. Mattermost Advisory ID: MMSA-2026-00691

References

https://mattermost.com/security-updates

Published: 2026-08-17 · Source: NVD · Feed updated: 2026-08-17

This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-08-17 via NVD.

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