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CVE-2026-19076

4.9 medium SSVC exploitation: none Analyzed
NVD · CVE.org

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to reject OAuth application sessions in the account type switch endpoint, which allows an attacker with a valid OAuth bearer token for a target user to permanently take over that user's SSO-backed account by setting an attacker-controlled password and detaching the account from its identity provider via a crafted request to POST /api/v4/users/login/switch.. Mattermost Advisory ID: MMSA-2026-00758

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+2 CPE criteria (now 2)NVD modified 2026-10-27 20:57
  2. StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-27 20:57
  3. CVSS4.4 (v3.1, CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N) → 4.9 (v3.1, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N)NVD modified 2026-10-27 20:57
  4. StatusReceived → Undergoing AnalysisNVD modified 2026-10-16 19:23
  5. First seenCVSS 4.4NVD modified 2026-10-16 08:17

Affected (CPE criteria) 2

  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
  • cpe:2.3:a:mattermost:mattermost_server:11.10.0:*:*:*:*:*:*:*

References 1