JetBrains TeamCity Relative Path Traversal Vulnerability
JetBrains TeamCity contains a relative path traversal vulnerability that could allow limited admin actions to be performed.
A remote attacker, without authentication, can achieve partial data exposure, partial data tampering, partial service disruption. CISA has confirmed use of this vulnerability in known ransomware campaigns — treat as high priority for remediation. Federal agencies are required to remediate by 2026-05-04 under CISA BOD 22-01.
This is a Software Vulnerability (CWE-23) (CWE-23) vulnerability in JetBrains TeamCity. In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.
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Phishing link
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Malicious file
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Server compromised
Probably yes if any of these apply:
Used in known ransomware campaigns. Threat-research write-up: https://www.darkreading.com/cyberattacks-data-breaches/jetbrains-teamcity-mass-exploitation-underway-rogue-accounts-thrive
Manual remediation steps
Apply the Vendor Patch
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.
CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
References
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References