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CVE-2026-63077 is an unauthenticated remote code execution vulnerability in JetBrains TeamCity affecting versions before 2026.1.3 and 2025.11.7. The flaw is exposed through the TeamCity agent polling protocol and can be exploited over the network without authentication or user interaction. The available classification maps the issue to CWE-502, indicating insecure handling of serialized or otherwise untrusted data in the protocol path, which can allow attacker-controlled input to trigger code execution on the TeamCity server.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.