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CERT-FR Flags Mattermost Server Vulnerabilities

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CERT-FR advises multiple unspecified vulnerabilities in Mattermost Server versions before 11.7.13, 11.10.3, and 11.11.2; patches available.

Sourcecert.ssi.gouv.fr — open the original

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CERT-FR issued an advisory regarding multiple vulnerabilities in Mattermost Server, a widely used team collaboration platform. The affected versions include 11.7.x prior to 11.7.13, 11.10.x prior to 11.10.3, and 11.11.x prior to 11.11.2. The vendor has not specified the exact nature of the security impact, and CERT-FR's advisory does not detail the risk level beyond noting it is unspecified by the publisher.

Defenders running Mattermost Server should consult the vendor's security bulletins (MMSA-2026-00772 and MMSA-2026-00783, both dated 20 October 2026) for full technical details and apply the available patches promptly. No indication of active exploitation is given in this advisory; organizations should treat this as a routine patch management item and upgrade to the fixed versions as soon as feasible.

Related reporting

Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1348

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