CVE-2023-34220
Published: 31 May 2023
Summary
CVE-2023-34220 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Jetbrains Teamcity. Its CVSS base score is 4.6 (Medium).
Operationally, ranked in the top 23.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-34220 is a stored cross-site scripting vulnerability (CWE-79) affecting the Commit Status Publisher window in JetBrains TeamCity versions prior to 2023.05. The flaw carries a CVSS 3.1 score of 4.6 and permits injection of persistent scripts that execute in the context of other users viewing the affected component.
An attacker with low-privileged authenticated access can supply malicious input through the Commit Status Publisher feature; when another user subsequently views the window, the script runs with that user's permissions, enabling limited data exposure or actions within the TeamCity interface.
JetBrains addressed the issue in the 2023.05 release, as documented on its privacy and security fixes page. The associated EPSS score rose from a low baseline to a peak of 0.0772 on 2025-12-11 before receding to the current value of 0.0091, indicating a period of increased exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-38317
Vulnerability details
In JetBrains TeamCity before 2023.05 stored XSS in the Commit Status Publisher window was possible
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.