CVE-2024-27199: JetBrains TeamCity Relative Path Traversal Vulnerability

In short

JetBrains TeamCity has a weakness classified as relative path traversal (CWE-23). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-04-20. NVD lists CVSS 3.1 at 7.3 HIGH. CISA reports known ransomware campaign use.

What it is

“JetBrains TeamCity contains a relative path traversal vulnerability that could allow limited admin actions to be performed.” — CISA KEV, retrieved 2026-11-01

“In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible” — NVD, retrieved 2026-11-01

Who is affected

JetBrains TeamCity. NVD lists the following versions as affected:

• Versions before 2023.11.4

Exploitation status

CISA KEV added: 2026-04-20. Known ransomware campaign use: Known (reported by CISA). Due date CISA set for US federal civilian agencies: 2026-05-04.

Scores

NVD CVSS 3.1: 7.3 HIGH; vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L; source [email protected].

EPSS by FIRST: 99.99%; percentile 99.98; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-23, CWE-22.

Timeline

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.” — CISA KEV

What to do

• Confirm whether you run JetBrains TeamCity and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.