CVEvulnerability

CVE-2026-19076

4.9 MEDIUM Published 2026-10-16 Modified 2026-10-27 Official page ↗
Status
Analyzed
Published
2026-10-16
Last modified
2026-10-27
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.4 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
CVSS 3.1 ([email protected])
4.9 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-863

Description

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

Affected configurations

• mattermost mattermost server (>= 11.7.0 < 11.7.10) • mattermost mattermost server (>= 11.8.0 < 11.8.6) • mattermost mattermost server (>= 11.9.0 < 11.9.2) • mattermost mattermost server 11.10.0

Related

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References