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[NEW] [medium] Mattermost Server: Multiple vulnerabilities enable unspecified attack

medium
An attacker can exploit multiple vulnerabilities in Mattermost Server to perform an unspecified attack.

CSIRTS triage

vendor: Mattermostproduct: Mattermost ServerOther
What
Multiple unspecified vulnerabilities exist in Mattermost Server that enable attacker exploitation.
Who is affected
All Mattermost Server deployments of affected versions.
Urgency
Medium severity; specific attack vectors are not detailed, limiting immediate risk assessment.
Action
Obtain the full advisory details and apply patches for the identified vulnerabilities.

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

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
medium
Published
2026-08-14
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2840

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-Bund (BSI) Security Advisories