CVEvulnerability

CVE-2026-16047

4.3 MEDIUM Published 2026-08-17 Modified 2026-08-18 Official page ↗
Status
Analyzed
Published
2026-08-17
Last modified
2026-08-18
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-862

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

Affected configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.22) • mattermost mattermost server (>= 11.7.0 < 11.7.7) • mattermost mattermost server (>= 11.8.0 < 11.8.4)

Related

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References