Is CVE-2026-7521 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-7521?

CVE-2026-7521 has a CVSS v3 severity of MEDIUM (5.5).

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CVE-2026-7521

Description

Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666