CVE-2026-20796 in Mattermost

Sumário

de MITRE • 13/02/2026

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549

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• Responsável: Mattermost
• Reservar: 15/01/2026
• Divulgação: 13/02/2026
• Moderação: aceite
• Entrada: VDB-345891
• CPE: pronto
• CWE: CWE-367 (confirmado)
• CVSS: 3.1 (CNA)
• EPSS: 0.00199
• KEV: não
• Atividades: muito baixo
• Sector: Insurance, Police, ...

Fontes

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-20796
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20796
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-20796/