CVE-2026-63077

JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

9.8

CVSS

1.0%

EPSS (exploit prob.)

59.8%

EPSS percentile

Yes

Actively exploited

Ransomware use

2026-08-05

Added

▲ +0.4 pts

2-day EPSS trend

Summary

JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.

Affected software

Vendor: JetBrains · Product: TeamCity

Weakness types (CWE):

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

Related vulnerabilities in JetBrains

CVE	Name	EPSS	Exploited
CVE-2024-27199	JetBrains TeamCity Relative Path Traversal Vulnerability	100.0%	Yes
CVE-2023-42793	JetBrains TeamCity Authentication Bypass Vulnerability	100.0%	Yes
CVE-2024-27198	JetBrains TeamCity Authentication Bypass Vulnerability	99.9%	Yes

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