CVE-2026-16045

MediumCVSS 4.3

Published: 17/08/2026(UTC)Updated: 18/08/2026(UTC)Translated: 18/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.20%

10th percentile - higher than 10% of all known CVEs

Summary

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to restrict OAuth deauthorization and personal access token management endpoints to direct user sessions, which allowed an OAuth app with a delegated user token to revoke the user's authorizations or tokens for other integrations via account-management endpoints.

Risk Assessment

The risk includes unauthorized revocation of authorizations or tokens, potentially disrupting integrations and compromising account security.

Recommendation

Upgrade Mattermost to a version that fixes this vulnerability (as per vendor recommendations).

Original NVD description (English source)

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 Mattermost failed to restrict OAuth deauthorization and personal access token management endpoints to direct user sessions, which allowed an OAuth app with a delegated user token to revoke the user's authorizations or tokens for other integrations via account-management endpoints.. Mattermost Advisory ID: MMSA-2026-00704