CVE-2026-15754

4.2 Moyenne

Publiée le 17/08/2026 à 17:16 · Modifiée le 18/08/2026 à 22:24 · Analysée par le NVD · Source : responsibledisclosure@mattermost.com

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

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Produits concernés

Mattermost
Mattermost mattermost server

Scores CVSS

Version	Score	Source	Vecteur
3.1	4.2 Moyenne	responsibledisclosure@mattermost.com	`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N`

Faiblesses (CWE)

CWE-863

Références

https://mattermost.com/security-updates Vendor Advisory

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories