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Multiple vulnerabilities in Mattermost Server (June 29, 2026)

unknown
Multiple vulnerabilities have been discovered in Mattermost Server. They allow an attacker to cause an unspecified security issue by the vendor.

CSIRTS triage

vendor: Mattermostproduct: Mattermost ServerOther
What
Multiple vulnerabilities have been discovered in Mattermost Server.
Who is affected
Users of Mattermost Server, specifics not detailed in the advisory.
Urgency
Remediation is necessary as the nature of the vulnerabilities is unspecified but could pose risks.
Action
Update Mattermost Server to the latest version to ensure vulnerabilities are addressed.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CERT-FR Avis de sécurité (FR · national-cert · site)
Severity
unknown
Published
2026-06-29
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0813/

Recent advisories for Mattermost Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CERT-FR Avis de sécurité