CVE-2026-96259 in Mattermost

Riassunto

di MITRE • 22/09/2026

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to apply the internal-connection filter to OAuth endpoint requests, which allows a System Administrator to make the server issue requests to internal network addresses and read the responses via the configured OAuth token and userinfo endpoints.. Mattermost Advisory ID: MMSA-2026-00776

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

• Responsabile: Mattermost
• Prenotare: 22/09/2026
• Divulgazione: 22/09/2026
• Moderazione: accettato
• Voce: VDB-408733
• CPE: pronto
• CWE: CWE-918 (confermato)
• CVSS: 5.5 (CNA)
• EPSS: 0.00000
• KEV: no
• Attività: molto basso
• Settore: Lawfirm, Hospital, ...

Fonti

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-96259
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-96259
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-96259/