CVE-2024-27199 JetBrains TeamCity: file path flaw
In plain words: The program can be tricked into reading or writing files outside the folder it should stay in. Leaks files such as passwords and settings, or overwrites important ones.
Confirmed exploited by CISA on · US federal patch deadline May 4, 2026
What to do
- Install JetBrains's security update for TeamCity. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- JetBrains TeamCity Relative Path Traversal Vulnerability
- Product
- JetBrains TeamCity
- CISA description
- JetBrains TeamCity contains a relative path traversal vulnerability that could allow limited admin actions to be performed.
- Type of flaw
- File path flaw (CWE-23)
- Confirmed exploited
- Apr 20, 2026 — known to be used in ransomware attacks
- US federal patch deadline
- May 4, 2026
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Answering about CVE-2024-27199 ·
Questions about CVE-2024-27199
Is CVE-2024-27199 being exploited?
Yes. CISA added CVE-2024-27199 to its Known Exploited Vulnerabilities catalog on Apr 20, 2026, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2024-27199?
Install JetBrains's security update for TeamCity. If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2024-27199?
Only if you use JetBrains TeamCity. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.