CVE-2024-56355
Published: 20 December 2024
Summary
CVE-2024-56355 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 2.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2024-56355 is a cross-site scripting vulnerability (CWE-79) affecting JetBrains TeamCity versions prior to 2024.12. The root cause is the absence of a Content-Type header in responses from the RemoteBuildLogController, which allows attacker-controlled content to be interpreted and executed as script by the browser.
An authenticated attacker with low privileges can trigger the flaw over the network by supplying a malicious request that elicits a response lacking the header. Successful exploitation requires user interaction such as clicking a crafted link and can result in limited disclosure or modification of data within the victim’s session, as reflected in the CVSS 4.6 score.
The official JetBrains advisory at https://www.jetbrains.com/privacy-security/issues-fixed/ identifies the issue among resolved security problems and states that the vulnerability is addressed by upgrading to TeamCity 2024.12 or later. The associated EPSS score has remained steady at 0.34 with no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-53124
Vulnerability details
In JetBrains TeamCity before 2024.12 missing Content-Type header in RemoteBuildLogController response could lead to XSS
- 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.