CVE-2025-12419
Dec. 3, 2025, 3:17 p.m.
9.9
Critical
Description
Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.
Product(s) Impacted
| Vendor | Product | Versions |
|---|---|---|
| Mattermost |
|
|
Weaknesses
Common security weaknesses mapped to this vulnerability.
CWE-303
Incorrect Implementation of Authentication Algorithm
The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.
*CPE(s)
Affected systems and software identified for this CVE.
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| a | mattermost | mattermost_server | / | / | / | / | / | / | / | / |
| a | mattermost | mattermost_server | / | / | / | / | / | / | / | / |
| a | mattermost | mattermost_server | / | / | / | / | / | / | / | / |
| a | mattermost | mattermost_server | / | / | / | / | / | / | / | / |
References
Tags
CVSS Score
CVSS Data - 3.1
- Attack Vector: NETWORK
- Attack Complexity: LOW
- Privileges Required: LOW
- Scope: CHANGED
- Confidentiality Impact: HIGH
- Integrity Impact: HIGH
- Availability Impact: HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Timeline
Published: Nov. 27, 2025, 4:15 p.m.
Last Modified: Dec. 3, 2025, 3:17 p.m.
Last Modified: Dec. 3, 2025, 3:17 p.m.
Status : Analyzed
CVE has had analysis completed and all data associations made.
More infoSource
responsibledisclosure@mattermost.com
*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.