JetBrains TeamCity Authentication Bypass
An authentication-bypass vulnerability in JetBrains TeamCity's web component allows a remote, unauthenticated attacker to perform admin actions on the CI/CD server, enabling full takeover of build pipelines.
- Vendor
- JetBrains
- Product
- TeamCity
- CVSS
- 9.8
- EPSS (exploit probability)
- 99.9%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Published
Is CVE-2024-27198 being exploited?
Yes. CISA added CVE-2024-27198 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 99.9% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2024-27198 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
CVE-2024-27198 is an authentication-bypass vulnerability in the web component of JetBrains TeamCity, a widely used continuous-integration and continuous-deployment (CI/CD) server. The flaw allows a remote, unauthenticated attacker to bypass authentication checks and perform administrative actions, including creating new admin accounts.
Rapid7 disclosed the vulnerability and a companion path-traversal flaw (CVE-2024-27199) on March 4, 2024, following coordinated disclosure with JetBrains, which shipped a fix the same day. Within days of disclosure, security researchers and threat-intel firms reported mass scanning and exploitation attempts against internet-facing TeamCity servers, including by ransomware-affiliated actors looking to poison software builds.
Why it mattered
A CI/CD server sits at the center of an organization’s software supply chain — compromise it and an attacker can potentially inject malicious code into every build the organization ships. That makes authentication-bypass flaws in tools like TeamCity especially dangerous: the blast radius extends to every downstream customer of the affected software, not just the breached organization.
JetBrains’ own security bulletin and the NVD record above contain the full technical writeup and patched version numbers.
Other JetBrains TeamCity CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2024-27199 JetBrains TeamCity Relative Path Traversal Vulnerabilityransomware use | [ HIGH ] | 7.3 | 100.0% | |
| CVE-2023-42793 JetBrains TeamCity Authentication Bypass Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 100.0% |
