Is CVE-2026-19541 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-19541?

CVE-2026-19541 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-19541

Description

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