On May 29, 2026, the French Cybersecurity Agency (CERT‑FR) released an alert detailing multiple vulnerabilities discovered in Mattermost Server products. The affected versions include Mattermost Server 10.11.x before 10.11.19, 11.5.x before 11.5.7, and 11.6.x before 11.6.4. The vulnerabilities can allow an attacker to trigger an unspecified security issue, as noted by the publisher. The alert references two Mattermost security bulletins (MMSA‑2026‑00619 and MMSA‑2026‑00635) issued on May 27, 2026, which provide the necessary fixes. Users are advised to consult the vendor’s security updates page for remediation steps.
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