Home › Exploited CVEs › CVE-2026-63077

CVE-2026-63077: JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

JetBrains TeamCity · in CISA KEV since 2026-08-05

2026-08-05added to KEV

2026-08-08federal remediation due date

86.52%EPSS exploit probability (30 days) 99.7th percentile

9.8 CRITICALCVSS 3.1

Knownknown ransomware use

9days from NVD publication to KEV

What it is

JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution 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.

CWE	CWE-502
CVSS vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
NVD published	2026-07-27 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-63077.json · all KEV CVEs

Kevscope: daily CISA KEV + EPSS datasetThe whole KEV catalog joined with daily EPSS and CVSS scores as CSV/Parquet, refreshed daily. Free to download.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.