CVE-2026-19541
CVE-2026-19541 · Outgoing OAuth connection client secret exposure during connection validation
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to require re-entry of the stored client secret when validating an outgoing OAuth connection, which allows an authenticated user with permission to manage outgoing OAuth connections to obtain the secret via pointing the token URL at an attacker-controlled endpoint and triggering validation.. Mattermost Advisory ID: MMSA-2026-00761
CVSS 6.5 · Medium · EPSS 0.2%
- Published
- Updated
Affected products and versions
mattermost
- Versions
- ≥ 11.9.0, ≤ 11.9.1: Affected (semver)
- ≥ 11.8.0, ≤ 11.8.5: Affected (semver)
- ≥ 11.7.0, ≤ 11.7.10: Affected (semver)
- ≥ 11.10.0, ≤ 11.10.1: Affected (semver)
- 11.11.0: Not affected
- 11.9.2: Not affected
- 11.8.6: Not affected
- 11.7.11: Not affected
- 11.10.2: Not affected
No fix published