What is CVE-2026-63077?
In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol
The record classifies CVE-2026-63077 under weakness class CWE-502. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 106 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 0.6% probability of exploitation in the next 30 days, higher than 47.3% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-07-27
Is CVE-2026-63077 being exploited?
It currently carries a trending score of 47 in the Threadlinqs vulnerability feed.
Affected products and versions
- JetBrains: TeamCity
How to fix CVE-2026-63077
No vendor patch reference has been recorded for CVE-2026-63077 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-63077
2 tracked threats in the Threadlinqs corpus reference CVE-2026-63077, either in the campaign’s CVE list or as an indicator on the campaign record.
- Kaspersky Q3 2026 Non-Mobile Threat Landscape: Qilin Ransomware via CVE-2026-0257, INC Ransom via SonicWall SMA1000 CVE-2026-15409/15410, macOS Stealers (PamStealer, MacSync, Overlord) and npm/PyPI/crates.io Supply-Chain Backdoors — HIGH · 2026-11-10
- CVE-2026-63077: Unauthenticated RCE in JetBrains TeamCity On-Premises via Agent Polling Protocol — CRITICAL · 2026-07-28
Sources
Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. This product uses the NVD API but is not endorsed or certified by the NVD.