Mattermost Server patches remote DoS flaw
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CERT-FR advises a remote denial-of-service vulnerability in Mattermost Server versions before 11.7.11, 11.8.6, 11.9.2, and 11.10.0.
CERT-FR issued an advisory regarding a vulnerability in Mattermost Server that allows a remote attacker to trigger a denial-of-service condition. The flaw, tracked as CVE-2026-116516, affects Mattermost Server versions 11.7.x prior to 11.7.11, 11.8.x prior to 11.8.6, 11.9.x prior to 11.9.2, and all versions prior to 11.10.0. Mattermost published the corresponding security bulletin MMSA-2026-00723 on 26 October 2026.
No evidence of active exploitation is mentioned in the advisory. Defenders running affected Mattermost Server versions should apply the vendor-provided patches referenced in the official security bulletin as soon as possible to mitigate the risk of service disruption.
Mentioned in this report
Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1388
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