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Mattermost security advisory (AV26-828)
Serial Number: AV26-828 Date: August 18, 2026 As of August 17, 2026, Mattermost is affected by vulnerabilities in the following product: • Mattermost • Prior to or equal to 10.11.21 • Prior to or equal to 11.7.6 • Prior to or equal to 11.8.3 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. • CVE-2026-9816 Detail • Mattermost Security Updates Mattermost security advisory (AV26-828) - Canadian Centre for Cyber Security
CVE-2026-9816 - Insufficient server-side validation of board member role fields permits privilege escalation
CVE ID : CVE-2026-9816 Published : Aug. 17, 2026, 10:17 p. m. • 50 minutes ago Description : Mattermost versions 11. 7. x Severity: 8. 3 • HIGH Visit the link for more details, such as CVSS details, affected products, timeline, and more...
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