{"cve":{"cve_id":"CVE-2026-63077","is_kev":true,"kev_date_added":"2026-08-05","kev_vendor_project":"JetBrains","kev_product":"TeamCity","kev_vulnerability_name":"JetBrains TeamCity Deserialization of Untrusted Data Vulnerability","kev_short_description":"JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.","kev_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.","kev_due_date":"2026-08-08","kev_known_ransomware":false,"kev_notes":"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","kev_cwes":["CWE-502"],"epss_score":0.84733,"epss_percentile":0.9969,"epss_as_of":"2026-08-26","description":"In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol","published_at":"2026-07-27T16:44:32.290000Z","last_modified_at":"2026-08-06T05:17:05.170000Z","cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":true,"ssvc_technical_impact":"total","cwes":["CWE-502"],"nvd_references":["https://www.jetbrains.com/privacy-security/issues-fixed/"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-07-27T19:04:23.263756Z","updated_at":"2026-08-06T17:42:07.491470Z"},"effective_severity":"CRITICAL","badges":["kev","poc","news","epss"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"jetbrains","vendor_name":"JetBrains","product_slug":"teamcity","product_name":"TeamCity","version_start":"0","version_start_inclusive":true,"version_end":"2026.1.3, 2025.11.7","version_end_inclusive":false,"cpe23_uri":"cve5:jetbrains:teamcity:0:2026.1.3, 2025.11.7"},{"vendor_slug":"jetbrains","vendor_name":"JetBrains","product_slug":"teamcity","product_name":"TeamCity","version_start":null,"version_start_inclusive":null,"version_end":"2025.11.7","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:jetbrains:teamcity:*:*:*:*:*:*:*:*"}],"exploit_refs":[{"source":"nuclei","kind":"nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-63077.yaml","title":"JetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution","author":"0x_Akoko,pdteam","disclosed_at":null}],"news":[{"id":1039,"source":"The Hacker News","url":"https://thehackernews.com/2026/08/cisa-flags-teamcity-cve-2026-63077-rce.html","title":"CISA Flags TeamCity CVE-2026-63077 RCE Flaw Under Active Exploitation in the Wild","summary":"A newly patched security flaw impacting on-premise versions of JetBrains TeamCity has come under active exploitation in the wild, according to the U.S. Cybersecurity and Infrastructure Security Agency (CISA).\n\nThe vulnerability in question is CVE-2026-63077 (CVSS score: 9.8), a case of deserialization of untrusted data that could allow an unauthenticated attacker with access to a TeamCity server","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaatZ2xKx3CMoWOXqKbIp1Sd-rMbET1_QE2Lh10XAVc_g_Z18UUlW_RyR8BR0Nj-gqy9SZhnEq0ZBv_z63FfCBu-XGfH5yEzUsKBLicrlfXK2-iMsgZYkDDTW-HiEPV29TEjFSFF1PYXyDkZcyfe6LuUKkgu2nRe4E_XFNPOcxSrBmUZwi3tX_GgHafeZ9/s1600/cisa-teamcity.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-08-06T06:51:43Z","fetched_at":"2026-08-06T08:38:38.673206Z","trending_score":0.0007759743158597724,"cve_ids":["CVE-2026-63077"]},{"id":852,"source":"The Hacker News","url":"https://thehackernews.com/2026/07/critical-teamcity-flaw-could-let.html","title":"Critical TeamCity Flaw Could Let Attackers Run OS Commands Without Logging In","summary":"JetBrains is urging customers of on-premise versions of TeamCity to update to the latest version following the discovery of a critical security issue that could result in arbitrary code execution.\n\nThe vulnerability, assigned CVE-2026-63077 (CVSS score: 9.8), affects all TeamCity On-Premises versions. It has been addressed in versions 2025.11.7 and 2026.1.3. TeamCity Cloud instances have already","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiX3xcF2Bm9BY5obe-T5JItuKynq8bPijOxp14p5damNEjPGtAbYyuLSqp6vKN_KkhPx1qYeTXHxpgnZllCrtLvDaDuJNyHpY1qV0i8KWCe79_bnFtBtTRPCTU28LcN7OFM26h_WZdxeM3KPWBK4dlp0jY8JKrs1UILNR0qRgtxhKJqCcrht69sc3gcwsU/s1600/tc.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-07-28T08:11:22Z","fetched_at":"2026-07-28T09:16:23.823056Z","trending_score":0.00003495728755609981,"cve_ids":["CVE-2026-63077"]}],"references":[{"url":"https://www.jetbrains.com/privacy-security/issues-fixed/","source_type":"MISC","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-07-27T16:44:32.290000Z","label":"CVE published","source":null},{"type":"first_article","at":"2026-07-28T08:11:22Z","label":"First news coverage","source":"The Hacker News"},{"type":"cisa_reported","at":"2026-08-05T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"ssvc_changed","at":"2026-08-05T18:41:38.287605Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"poc_available","at":"2026-08-09T20:15:49.989174Z","label":"Public PoC available","source":"nuclei"}]}