{"schema":"threatline.record/2","record":{"id":"CVE-2026-63077","aliases":[],"summary":"JetBrains TeamCity Deserialization of Untrusted Data Vulnerability","details":"JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.","categories":["Applications & CMS"],"product":"TeamCity","vendor":"JetBrains","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-63077","source_modified_at":"2026-09-23T03:55:33.804Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"TeamCity","vendor":"JetBrains","versions":[{"lessThan":"2026.1.3, 2025.11.7","status":"affected","version":"0","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-63077","source_modified_at":"2026-09-23T03:55:33.804Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"TeamCity","ecosystem":null},"version":"2026.1.3, 2025.11.7","basis":"first unaffected version stated in the CVE record"}],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2026-08-05","due_date":"2026-08-08","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_campaign_use":"Known","forensic_triage":true},"epss":{"probability":0.8957,"percentile":0.9979,"score_date":"2026-10-23"},"published_at":"2026-07-27T16:44:32.290Z","modified_at":"2026-09-23T03:55:33.804Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-63077","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-09-23T03:55:33.804Z"},{"source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/jetbrains_teamcity_rce_cve_2026_63077.rb","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-07-27"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-63077.yaml","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":null},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-63077","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Metasploit","Nuclei","EPSS"],"references":[{"url":"https://blog.jetbrains.com/teamcity/2026/07/cve-2026-63077/","source":"CISA KEV"},{"source":"CVE List","url":"https://www.jetbrains.com/privacy-security/issues-fixed/"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63077","source":"CISA KEV"},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-63077","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2026-07-27T00:00:00+00:00"},"exploits":[{"added":"2026-08-27","check":true,"date":"2026-07-27","kind":"Exploit module","name":"JetBrains TeamCity Agent Polling Unauthenticated Remote Code Execution","source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/jetbrains_teamcity_rce_cve_2026_63077.rb"},{"kind":"Scanner template","name":"JetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution","source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-63077.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-23T03:55:33.804Z","content_hash":"0c17e4973002d0b284ffc1e3732c6b374a3c090bdb399f64fc2c4044e4ac0b68"}}