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CVE-2026-19603

4.3 medium SSVC exploitation: none Undergoing Analysis
NVD · CVE.org

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

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusReceived → Undergoing AnalysisNVD modified 2026-10-16 19:23
  2. First seenCVSS 4.3NVD modified 2026-10-16 07:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1