Security Digest · Vulnerability record · Known exploited
CVE-2024-27199: JetBrains TeamCity Relative Path Traversal Vulnerability
Exploited in the wild (CISA KEV). In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible
CISA KEV · added 2026-04-20 CVSS 7.3 High EPSS 100.0% · p100.0
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run JetBrains TeamCity. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-04-20, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-05-04; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns.
- EPSS 100.0%, percentile 100.0: FIRST’s model estimates a 100.0% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
What it is
In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible
CISA’s summary
JetBrains TeamCity contains a relative path traversal vulnerability that could allow limited admin actions to be performed.
Weakness type: CWE-23.
Product: JetBrains TeamCity · Assigned by: JetBrains · Published: 2024-03-04
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| JetBrains | TeamCity | < 2023.11.4 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| JetBrains | 3.1 | 7.3 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2026-04-20; federal due date 2026-05-04. Known ransomware use: Known.
- 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 SSVC assessment: exploitation active, automatable yes, technical impact partial.
- FIRST EPSS (model of 2026-10-21): 99.99% probability of exploitation activity in the next 30 days; percentile 100.0.
Timeline
- — CVE record published by JetBrains
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CVE record last updated
- — CISA remediation deadline for US federal agencies
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (jetbrains.com) jetbrains.com
- Listed in CISA KEV notes (blog.jetbrains.com) blog.jetbrains.com
Vulnerability records
- CVE.org record CVE-2024-27199 cve.org
- NVD entry CVE-2024-27199 nvd.nist.gov
Government
Other references from the CVE record and advisory
- darkreading.com darkreading.com
- github.com github.com
All exploited JetBrains vulnerabilities · Today’s Security Digest