CVE-2026-63077
CriticalExploitedPublic exploitIn JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
Published Jul 27, 2026 · Updated Sep 23, 2026
Key Facts
Patch immediately- CVE-2026-63077 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting TeamCity (Jetbrains).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 5, 2026 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 90% probability of exploitation in the next 30 days.
- Fixed versions are available, including TeamCity 2025.11.7, TeamCity 2026.1.3, TeamCity 2026.1.3, 2025.11.7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
90%
Higher than 99.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-63077 brief as a PDF
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Description
In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 5, 2026 | Aug 8, 2026 | Known |
| Industry KEV feed | Aug 5, 2026 | Aug 8, 2026 | Known |
| CIRCL KEV | Aug 5, 2026 | Aug 8, 2026 | Not reported |
| ENISA EUVD | Aug 5, 2026 | n/a | Not reported |
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| TeamCityJetbrains | See advisory | 2025.11.7 |
Patched Releases
TeamCity
2025.11.7, 2026.1.3, 2026.1.3, 2025.11.7
Timeline
Publicly disclosed
Jul 27, 2026
Added to CISA KEV
Aug 5, 2026
Added to Industry KEV feed
Aug 5, 2026
Added to CIRCL KEV
Aug 5, 2026
Added to ENISA EUVD
Aug 5, 2026
Last updated
Sep 23, 2026
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- exploitMSF jetbrains_teamcity_rce_cve_2026_63077.rb
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
Affected: TeamCity (Jetbrains). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 5, 2026 and is known to be used in ransomware campaigns.
Yes. It was added on Aug 5, 2026 with a federal remediation due date of Aug 8, 2026.
Public exploit code is available.
Fixed versions are available, including TeamCity 2025.11.7, TeamCity 2026.1.3, TeamCity 2026.1.3, 2025.11.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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