CVE-2025-11794 Password hash and MFA secret returned in user email verification endpoint

What is CVE-2025-11794?

CVE-2025-11794 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 14 Nov 2025. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to sanitize user data which allows system administrators to access password hashes and MFA secrets via the POST /api/v4/users/{user_id}/email/verify/member endpoint

Weakness: CWE-200

Which versions are affected by CVE-2025-11794?

12 open source packages ship an affected version, including github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5 and github.com/mattermost/mattermost-server/v6. It affects 1 product.

Products include Mattermost Mattermost Server.

How do I fix CVE-2025-11794?

Upgrade github.com/mattermost/mattermost-server to a fixed version for your release line: 10.11.4, 10.12.1, 10.5.12 or 10.5.12+incompatible.

Is CVE-2025-11794 being exploited?

There is no known exploitation of CVE-2025-11794 in the wild and no public exploit code.

Other vulnerabilities in Mattermost Mattermost Server

• CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers Critical 9.9
• CVE-2025-12421 Account Takeover via Code Exchange Endpoint Critical 9.9
• CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User Critical 9.9
• CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards Critical 9.9
• CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive Critical 9.9

All Mattermost Mattermost Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mqp8-pgg5-7x7m, GO-2025-4130.