CVEvulnerability

CVE-2026-15754

4.2 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])
4.2 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N
Weaknesses
CWE-863

Description

Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate that each target channel still belongs to the requesting admin's team, which allows an authenticated team administrator to remove ABAC (attribute-based access control) policy assignments from channels outside their team via the policy unassign API after a channel has been moved to another team.. Mattermost Advisory ID: MMSA-2026-00718

Affected configurations

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

Related

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References