CVE-2025-21611 tgstation-server's role authorization incorrectly OR'd with user's enabled status

What is CVE-2025-21611?

CVE-2025-21611 is a high-severity missing authorization vulnerability in tgstation-server, published on 6 Jan 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

tgstation-server is a production scale tool for BYOND server management. Prior to 6.12.3, roles used to authorize API methods were incorrectly OR'd instead of AND'ed with the role used to determine if a user was enabled. This allows enabled users access to most, but not all, authorized actions regardless of their permissions. Notably, the WriteUsers right is unaffected so users may not use this bug to permanently elevate their account permissions. The fix is release in tgstation-server-v6.12.3.

Weakness: CWE-285

Which versions are affected by CVE-2025-21611?

It affects 1 product.

Products include Tgstation13 Tgstation-Server.

How do I fix CVE-2025-21611?

Upgrade to a fixed version.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-21611 being exploited?

There is no known exploitation of CVE-2025-21611 in the wild and no public exploit code.

Other vulnerabilities in tgstation-server

• CVE-2018-17107 tgstation-server cached user logins in legacy server Critical 9.8
• CVE-2024-41799 tgstation-server's DreamMaker environment files outside the deployment directory can be compiled and ran by insufficiently permissioned users High 8.4
• CVE-2023-32687 Insufficiently Protected ChatBot Credentials in tgstation-server High 7.7
• CVE-2020-16136 Path traversal in n/a High 7.7
• CVE-2023-33198 Incorrectly Specified Chat Message Destinations in tgstation-server and DreamMaker API Medium 6.1

Sources

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

Also known as CLEANSTART-2026-KM75633, GHSA-rf5r-q276-vrc4.