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cve recordcriticalexploited in the wild

CVE-2026-63077

JetBrains · TeamCity · JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

Published · Added to CISA KEV
CVSS9.8
Severitycritical
WeaknessCWE-502
ExploitedYes, in CISA KEV
Ransomware useUnknown
Federal fix dueAug 8, 2026

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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

Required action (CISA)

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

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Our coverage of CVE-2026-63077

CVE-2026-63077critical

Rapid7 Analysis: Unauthenticated Remote Code Execution in JetBrains TeamCity (CVE-2026-63077)

JetBrains TeamCity is affected by CVE-2026-63077, a critical vulnerability allowing unauthenticated remote code execution. An attacker can exploit the agent polling protocol to execute OS commands with the privileges of the TeamCity server process. While initially not known to be exploited, CISA has confirmed its use in the wild.

CVE-2026-63077critical

Hackers Start Exploiting Recent JetBrains TeamCity Vulnerability

Tracked as CVE-2026-63077, the critical bug can be exploited without authentication for remote code execution. The post Hackers Start Exploiting Recent JetBrains TeamCity Vulnerability appeared first on SecurityWeek.