[NEW] [medium] Mattermost: Multiple vulnerabilities allow unspecified attack
A remote, anonymous attacker can exploit multiple vulnerabilities in Mattermost to carry out an unspecified attack.
CSIRTS triage
- What
- Multiple vulnerabilities allow unspecified attacks against Mattermost.
- Who is affected
- Remote, anonymous users of Mattermost are affected.
- Urgency
- Remediation is important as multiple vulnerabilities exist, though specific exploitation details are not provided.
- Action
- Monitor for updates from Mattermost regarding these vulnerabilities.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2411
Recent advisories for Mattermost
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.
- mediumCVE-2026-7521: Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 f…nvd · 2026-07-28
- medium[UPDATE] [medium] Mattermost Server: Multiple vulnerabilitiescert-bund · 2026-07-28
- mediumCVE-2026-10819: Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 …nvd · 2026-07-27
- mediumCVE-2026-10600: Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 …nvd · 2026-07-27
- unknownMultiple vulnerabilities in Mattermost Server (July 20, 2026)cert-fr-avis · 2026-07-20
- mediumCVE-2026-9602: Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Ma…nvd · 2026-07-17
More from CERT-Bund (BSI) Security Advisories
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- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow Denial of Service2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow unspecified attack2026-07-31