Vulnerabilities CVE-2026-9693

CVE-2026-9693

Low

Open

TLP:CLEAR

Mattermost thread memberships persist after team removal, exposing private channel thread metadata on re-invite

NVD CVE.org

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Description

Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682

Details

CVSS Score: 3.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Confidence: 90%
Published: Aug 17, 2026
Last Modified: Aug 17, 2026

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