In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible

cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

1. 2024-03-04 First public exploit (Metasploit exploit/multi/http/jetbrains_teamcity_rce_cve_2024_27198)
2. 2024-03-04 Published
3. 2024-03-07 Added to CISA KEV
4. 2024-03-20 CISA SSVC: exploitation active
5. 2024-03-28 CISA patch deadline

Added

2 y ago (2024-03-07)

Patch by

2024-03-28 (2 y ago)

Ransomware

Known to be used in ransomware campaigns

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vendor, product

JetBrains, TeamCity

CISA name

JetBrains TeamCity Authentication Bypass Vulnerability

Groups reported to have exploited it in intrusions.

• BianLian ransomware gang

reported by guidepointsecurity.com

Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0

How it is exploited and what it leads to, in MITRE ATT&CK terms.

• T1190 Exploit Public-Facing Application exploitation
• T1059 Command and Scripting Interpreter primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

Exploitation

Active, exploited in the wild

Automatable

yes

Technical impact

total

Assessed

2 y ago (2024-03-20)

99.94% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

• Metasploit exploit/multi/http/jetbrains_teamcity_rce_cve_2024_27198 JetBrains TeamCity Unauthenticated Remote Code Execution metasploit exploit, excellent rank, 2024-03-04
• EDB-52411 JetBrains TeamCity 2023.11.4 - Authentication Bypass webapps, 2025-08-11
• Nuclei template TeamCity < 2023.11.4 - Authentication Bypass nuclei detection template

• JetBrains TeamCity

Weakness

• CWE-288 Authentication Bypass Using an Alternate Path or Channel

• jetbrains.com /privacy-security/issues-fixed/

  vendor-advisory

• darkreading.com /cyberattacks-data-breaches/jetbrains-teamcity-mass-exploitation-underway-rogue-accounts-thrive

  press/media-coverage, third-party-advisory

• cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27198

  government-resource, us-government-resource

• CVE List CVE-2024-27198
• NVD CVE-2024-27198

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.