Security Advisory

CVE-2026-16047

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-17 14:25:08

Last updated 2026-08-17 15:26:34

Assigner Mattermost

CVSS score 4.3

State PUBLISHED

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to validate that users have read access to a channel before linking a board to it, which allows an authenticated attacker to discover the membership of private channels on the same team via creating, patching, importing, or bulk-creating boards with an arbitrary channelId. Mattermost Advisory ID: MMSA-2026-00674

← Browse all CVEs View on cve.org ↗