Critical 9.8Known exploited (CISA KEV)Published Sep 19, 2023

CVE-2023-42793In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible

Updated under an hour ago (Oct 27, 2026, 9:00 AM ET)

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It affects JetBrains TeamCity. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Oct 4, 2023; federal agencies had to remediate by Oct 25, 2023, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for JetBrains TeamCity

Exploited in the last 30 days

In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-288
Known exploited: Added to CISA KEV Oct 4, 2023; federal remediation due Oct 25, 2023; known ransomware useApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 99.99% (percentile 100)
Assigned by: JetBrains
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

JetBrains TeamCity jetbrains:teamcity (from the name)	before 2023.05.4	CNA record
jetbrains teamcity jetbrains:teamcity	before 2023.05.4	NVD

References

References

https://www.jetbrains.com/privacy-security/issues-fixed/	vendor-advisory
https://blog.jetbrains.com/teamcity/2023/09/cve-2023-42793-vulnerability-post-mortem/	vendor-advisory
http://packetstormsecurity.com/files/174860/JetBrains-TeamCity-Unauthenticated-Remote-Code-Execution.html	exploit, third-party-advisory, vdb-entry
https://attackerkb.com/topics/1XEEEkGHzt/cve-2023-42793	third-party-advisory
https://www.securityweek.com/recently-patched-teamcity-vulnerability-exploited-to-hack-servers/	press/media-coverage
https://www.rapid7.com/blog/post/2023/09/25/etr-cve-2023-42793-critical-authentication-bypass-in-jetbrains-teamcity-ci-cd-servers/	broken-link, third-party-advisory
https://www.sonarsource.com/blog/teamcity-vulnerability/	exploit, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-42793	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.