Is CVE-2026-19600 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-19600?

CVE-2026-19600 has a CVSS v3 severity of MEDIUM (4.5).

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CVE-2026-19600

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 sanitize authentication tokens before writing them to server log entries, which allows an attacker with access to server logs to obtain valid session tokens or OAuth access tokens and impersonate authenticated users via the debug-level Mattermost server log.. Mattermost Advisory ID: MMSA-2026-00763