BeyondTrust Remote Support <= 26.2.3 - Origin Validation File Upload

id: CVE-2026-102764

info:
  name: BeyondTrust Remote Support <= 26.2.3 - Origin Validation File Upload
  author: DhiyaneshDk
  severity: critical
  description: |
    The vulnerability exists within internal components of BeyondTrust’s Remote Support product. The components did not adequately validate the origin of the messages it received. Under the right conditions, this could allow an attacker to perform file operations on the appliance.
  impact: |
    Attackers can perform unauthorized file operations on the appliance, potentially leading to data tampering or system compromise.
  remediation: |
    Apply the BT26-05-RS patch or upgrade to a fixed BeyondTrust Remote Support build. SaaS instances were patched by the vendor.
  reference:
    - https://www.beyondtrust.com/trust-center/security-advisories/bt26-05
    - https://github.com/rapid7/metasploit-framework/pull/22083
    - https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-102764
    - https://nvd.nist.gov/vuln/detail/CVE-2026-102764
  classification:
    cvss-metrics: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
    cvss-score: 9.3
    cve-id: CVE-2026-102764
    epss-score: 0.1895
    epss-percentile: 0.97304
    cwe-id: CWE-290
  metadata:
    verified: true
    max-request: 1
    vendor: beyondtrust
    product: remote_support
    shodan-query: http.title:"BeyondTrust"
  tags: cve,cve2026,beyondtrust,rce,kev,vkev

http:
  - raw:
      - |
        GET /get_rdf?comp=sdcust&locale_code=en-us HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "0 Successful"
          - "BRDF"
          - "Thank you for using BeyondTrust"
        condition: and

      - type: dsl
        dsl:
          - "compare_versions(version, '<= 26.2.3')"

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        name: version
        part: body
        group: 1
        regex:
          - '(?s)BRDF.{6}([0-9]+\.[0-9]+\.[0-9]+(?:\.[0-9]+)?)'
# digest: 4b0a00483046022100ceaccde972604fe17b13179383b5abfc59c80f41e9bf6561686f71923ef0599c022100a0a480212c847d0768b5dac00a824804f7b208dd15d117b615b1711a059620c6:922c64590222798bb761d5b6d8e72950