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CVE-2026-63077

CRITICAL
9.8
CVSS Score
Published: July 27, 2026 at 04:44 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
1 product affected across 1 vendorTeamCity

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 94%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score93.6%

EPSS (Exploit Prediction Scoring System) estimates a 93.6% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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

Required Action
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.
Ransomware Use
Known
Added to KEV
Aug 5, 2026
Remediation Due
Aug 8, 2026
85 days overdue
Notes
https://blog.jetbrains.com/teamcity/2026/07/cve-2026-63077/
https://www.jetbrains.com/privacy-security/issues-fixed/
BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
https://nvd.nist.gov/vuln/detail/CVE-2026-63077

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

TeamCity· JetBrains
95%
v < 2025.11.72026.1 ≤ v < 2026.1.3
Affected range stops below 2025.11.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.1.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.1.3, 2025.11.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://www.jetbrains.com/privacy-security/issues-fixed/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-63077

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALJetBrains
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-502

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