CVE-2023-34243: TGSTATION13 Tgstation-Server

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

TGstation is a toolset to manage production BYOND servers. In affected versions if a Windows user was registered in tgstation-server (TGS), an attacker could discover their username by brute-forcing the login endpoint with an invalid password. When a valid Windows logon was found, a distinct response would be generated. This issue has been addressed in version 5.12.5. Users are advised to upgrade. Users unable to upgrade may be mitigated by rate-limiting API calls with software that sits in front of TGS in the HTTP pipeline such as fail2ban.

Affected products

• TGSTATION13 Tgstation-Server: from 4.0.0.0, before 5.12.5 (fixed in 5.12.5)

Published 2023-06-08. Last modified 2026-06-17.