anonhaven

CVE-2026-63077

CRITICAL CVSS 3.1: 9.8 EPSS 87.7% ACTIVE EXPLOIT
Updated Aug 06, 2026
Jetbrains

CISA Known Exploited Vulnerability (KEV)

This vulnerability is actively exploited in the wild. Immediate patching is strongly recommended.

Due Date: Aug 08, 2026

Parameter Value
CVSS 9.8 (CRITICAL)
Affected Versions 2026.1 — 2026.1.3
Fixed In 2025.11.7
Type CWE-502 (Deserialization of Untrusted Data)
Vendor Jetbrains
Public PoC Yes

In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Jetbrains Teamcity
cpe:2.3:a:jetbrains:teamcity:*:*:*:*:*:*:*:*
 — 2025.11.7
Jetbrains Teamcity
cpe:2.3:a:jetbrains:teamcity:*:*:*:*:*:*:*:*
 2026.1 2026.1.3

References 2

https://www.jetbrains.com/privacy-security/issues-fixed/
cve@jetbrains.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026…
134c704f-9b21-4f2e-91b3-4a467353bcc0
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