CVE-2023-42793
KEVRansomware UseJetBrains TeamCity Authentication Bypass Vulnerability
Description
JetBrains TeamCity contains an authentication bypass vulnerability that allows for remote code execution on TeamCity Server.
In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HPublishedSep 19, 2023
Last modifiedJun 17, 2026
Added to KEVOct 4, 2023
Remediation dueOct 25, 2023
References
- packetstormsecurity.com/files/174860/JetBrains-TeamCity-Unauthenticated-Remote-Code-Execution.htmlExploitThird Party Advisory
- attackerkb.com/topics/1XEEEkGHzt/cve-2023-42793Third Party Advisory
- blog.jetbrains.com/teamcity/2023/09/cve-2023-42793-vulnerability-post-mortem/Vendor Advisory
- jetbrains.com/privacy-security/issues-fixed/Vendor Advisory
- rapid7.com/blog/post/2023/09/25/etr-cve-2023-42793-critical-authentication-bypass-in-jetbrains-teamcity-ci-cd-servers/Broken LinkThird Party Advisory
- securityweek.com/recently-patched-teamcity-vulnerability-exploited-to-hack-servers/Press/Media Coverage
- sonarsource.com/blog/teamcity-vulnerability/ExploitThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-42793US Government Resource
0 recent articles mention this CVE
99
Risk assessment · Critical
Actively exploited and used by ransomware crews. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1099 days
- Ransomware
- Used in known ransomware campaigns
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 100.0% · top 1% of all CVEs
- Weakness
- CWE-288
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
- 5.Verify offline/immutable backups and segment the affected systems. This flaw is used for ransomware initial access.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.