CVE-2024-27198

JetBrains TeamCity Authentication Bypass Vulnerability

Exploited in attacks Used by ransomware Critical 9.8 Attack chance: 99.9%

What it is

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

CISA: JetBrains TeamCity contains an authentication bypass vulnerability that allows an attacker to perform admin actions.

What to do

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

Deadline for US federal agencies: March 28, 2024

Added to the CISA list: March 7, 2024
Published: March 4, 2024
Severity: Critical 9.8 CVSS 3.1
Chance of attacks in the next 30 days (EPSS): 99.9% in the top 0.1% of all known vulnerabilities
Weakness: CWE-288
More details: NVD · CVE.org · CISA

All references (2)

More exploited flaws from JetBrains

Added	Vulnerability	Product	Severity	Attack chance
Aug 5, 2026	Deserialization of Untrusted DataCVE-2026-63077used by ransomware	TeamCity	Critical 9.8	94%
Apr 20, 2026	Relative Path TraversalCVE-2024-27199used by ransomware	TeamCity	High 7.3	>99.9%
Oct 4, 2023	Authentication BypassCVE-2023-42793used by ransomware	TeamCity	Critical 9.8	>99.9%

All of them →

Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.