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CVE-2026-19600

4.9 medium SSVC exploitation: none Analyzed
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 authentication tokens before writing them to server log entries, which allows an attacker with access to server logs to obtain valid session tokens or OAuth access tokens and impersonate authenticated users via the debug-level Mattermost server log.. Mattermost Advisory ID: MMSA-2026-00763

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 5

  1. Cpes+1 CPE criteria (now 1)NVD modified 2026-10-27 20:58
  2. StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-27 20:58
  3. CVSS4.5 (v3.1, CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N) → 4.9 (v3.1, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N)NVD modified 2026-10-27 20:58
  4. StatusReceived → Undergoing AnalysisNVD modified 2026-10-16 19:23
  5. First seenCVSS 4.5NVD modified 2026-10-16 08:17

Affected (CPE criteria) 1

  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*

References 1