CVE-2026-63077 (GCVE-0-2026-63077)

Vulnerability from cvelistv5 – Published: 2026-07-27 16:44 – Updated: 2026-08-06 03:55
VLAI CISA KEVIntel
Summary
In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 00:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
JetBrains TeamCity Affected: 0 , < 2026.1.3, 2025.11.7 (semver)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 326e4a41-68fa-4df5-8762-e7ed3bc289fc

Vulnerability ID: CVE-2026-63077

Status: Confirmed

Status Updated: 2026-08-05 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-05
Asserted: 2026-08-05
Scope
Notes: JetBrains TeamCity Deserialization of Untrusted Data Vulnerability | Affected: JetBrains / TeamCity | Description: 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. | Due date: 2026-08-08 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-502
Feed CISA Known Exploited Vulnerabilities Catalog
Product TeamCity
Due Date 2026-08-08
Date Added 2026-08-05
Vendorproject JetBrains
Vulnerabilityname JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-08-05 18:00 UTC | Updated: 2026-08-05 18:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ea753bd3-3d48-4bc2-9fe1-286487e6868f

Vulnerability ID: CVE-2026-63077

Status: Confirmed

Status Updated: 2026-08-05 16:50 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-05
Asserted: 2026-08-05
Scope
Notes: In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol | Affected: JetBrains / TeamCity | CVSS: 9.8 (CRITICAL) | EPSS: 0.00649 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
Vendor JetBrains
Product TeamCity
Added Date 2026-08-05T16:50:38.645Z
Cvss Score 9.8
Epss Score 0.00649
Cvss Severity CRITICAL
Epss Percentile 0.47585
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-08-05 18:00 UTC | Updated: 2026-08-05 18:00 UTC
Show details on NVD website
To clipboard 

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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.