CVE-2026-16045
published 2026-08-17CVE-2026-16045: 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…
PriorityP423medium4.3CVSS 3.1
AVNACLPRLUINSUCNINAL
EPSS
0.33%
24.8th percentile
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
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mattermost | mattermost | 10.11.0 – 10.11.21 | — |
| mattermost | mattermost | 11.7.0 – 11.7.6 | — |
| mattermost | mattermost_server | >= 10.11.0 < 10.11.22 | 10.11.22 |
| mattermost | mattermost_server | >= 11.7.0 < 11.7.7 | 11.7.7 |
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VulDB
Mattermost up to 10.11.21/11.7.6 OAuth Token Management improper authorization (Nessus ID 338331)
vuldb·2026-08-21·CVSS 4.3
CVE-2026-16045 [MEDIUM] Mattermost up to 10.11.21/11.7.6 OAuth Token Management improper authorization (Nessus ID 338331)
A vulnerability, which was classified as problematic, has been found in Mattermost up to 10.11.21/11.7.6. This impacts an unknown function of the component OAuth Token Management. The manipulation leads to improper authorization.
This vulnerability is documented as CVE-2026-16045. The attack can be initiated remotely. There is not any exploit available.
It is advisable to upgrade the affected component.
GHSA
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 O
ghsa_unreviewed·2026-08-17
CVE-2026-16045 [MEDIUM] CWE-863 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 O
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
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-08-17
Published