JetBrains · TeamCity
CVE-2023-42793
JetBrains TeamCity Authentication Bypass Vulnerability
Exploited in attacks
Used by ransomware
Critical 9.8 Attack chance: >99.9%
What it is
In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible
CISA: JetBrains TeamCity contains an authentication bypass vulnerability that allows for remote code execution on TeamCity Server.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: October 25, 2023
- Added to the CISA list
- October 4, 2023
- Published
- September 19, 2023
- Severity
- Critical 9.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- >99.9% in the top 0.1% of all known vulnerabilities
- Weakness
- CWE-288
- More details
- NVD · CVE.org · CISA
All references (7)
- https://www.jetbrains.com/privacy-security/issues-fixed/
- https://blog.jetbrains.com/teamcity/2023/09/cve-2023-42793-vulnerability-post-mortem/
- http://packetstormsecurity.com/files/174860/JetBrains-TeamCity-Unauthenticated-Remote-Code-Execution.html
- https://attackerkb.com/topics/1XEEEkGHzt/cve-2023-42793
- https://www.securityweek.com/recently-patched-teamcity-vulnerability-exploited-to-hack-servers/
- https://www.rapid7.com/blog/post/2023/09/25/etr-cve-2023-42793-critical-authentication-bypass-in-jetbrains-te…
- https://www.sonarsource.com/blog/teamcity-vulnerability/
More exploited flaws from JetBrains
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Aug 5, 2026 | Deserialization of Untrusted Data | TeamCity | Critical 9.8 | 94% |
| Apr 20, 2026 | Relative Path Traversal | TeamCity | High 7.3 | >99.9% |
| Mar 7, 2024 | Authentication Bypass | TeamCity | Critical 9.8 | 99.9% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.