CVE-2024-2450 Auth bypass in Mattermost

What is CVE-2024-2450?

CVE-2024-2450 is a high-severity authentication bypass vulnerability in Mattermost Mattermost Server, published on 15 Mar 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Mattermost versions 8.1.x before 8.1.10, 9.2.x before 9.2.6, 9.3.x before 9.3.2, and 9.4.x before 9.4.3 fail to correctly verify account ownership when switching from email to SAML authentication, allowing an authenticated attacker to take over other user accounts via a crafted switch request under specific conditions.

Weakness: CWE-306, CWE-287

Which versions are affected by CVE-2024-2450?

1 open source package ship an affected version, including mattermost. It affects 1 product.

Products include Mattermost Mattermost Server.

How do I fix CVE-2024-2450?

Upgrade mattermost to a fixed version for your release line: 8.1.10, 9.2.6, 9.3.2 or 9.4.3.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2024-2450 being exploited?

There is no known exploitation of CVE-2024-2450 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 BIT-mattermost-2024-2450, GHSA-33qh-fj99-2gvg.