Security Advisory

CVE-2026-5163

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-18 08:11:13

Last updated 2026-05-18 14:40:03

Assigner Mattermost

CVSS score 6.5

State PUBLISHED

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

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