CVE-2026-19603

4.3 Moyenne

Publiée le 16/10/2026 à 09:17 · Modifiée le 16/10/2026 à 21:23 · Analyse NVD en cours · Source : responsibledisclosure@mattermost.com

Description

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize the active channel field returned by the user status API endpoints, which allows an authenticated user to learn the channel ID of a private channel another user is actively viewing via the status endpoints, without being a member of that channel. Mattermost Advisory ID: MMSA-2026-00765

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Produits concernés

Mattermost

Scores CVSS

Version	Score	Source	Vecteur
3.1	4.3 Moyenne	responsibledisclosure@mattermost.com	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`

Faiblesses (CWE)

CWE-201

Références

https://mattermost.com/security-updates

Ailleurs

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