Medium severity4.3NVD Advisory· Published Oct 16, 2026
CVE-2026-19603
CVE-2026-19603
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=11.9.1, <=11.8.5, <=11.7.10, <=11.10.1
Patches
Vulnerability mechanics
References
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