CyberRota Analysis
This is a medium severity vulnerability with a CVSS score of 6.5. Exploitation may require the attacker to be authenticated.
CVE
CVE-2026-5163
Severity
MEDIUM
CVSS
6.5
EPSS
0.21%
Original NVD Description
Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to the post rewrite endpoint.. Mattermost Advisory ID: MMSA-2026-00645
Related CVEs
Other vulnerabilities affecting the same vendor(s)