CVE-2026-19076
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
55/100
Published: 2026-10-16
Modified: 2026-10-27
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Interaction
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
High
UI:
None
S:
Unchanged
C:
None
I:
High
A:
None
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
Weakness Classification (1)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 11.7.0 – 11.7.10 |
| mattermost | mattermost_server | 11.10.0 |
References & Advisories (1)
Vendor Advisory