id: CVE-2026-88771

info:
  name: "Citrix - Improper Input Validation"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue
    affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and
    NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute
    arbitrary commands.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-88771&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=citrix&match=exact
  classification:
    cvss-metrics: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
    cvss-score: 9.5
    cve-id: CVE-2026-88771
    cwe-id: CWE-20
  metadata:
    verified: true
    max-request: 2
  tags: cve,cve2026,citrix,netscaler,adc,gateway,rce,preauth,kev

http:
  - raw:
      # 1) sanity check: NetScaler LogonPoint present
      - |
        GET /logon/LogonPoint/tmindex.html HTTP/1.1
        Host: {{Hostname}}

      # 2) passive build fingerprint via the served EPA plugin size
      - |
        GET /epa/scripts/linux/nsepa.deb HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - "status_code_1 == 200"
          - "contains(body_1, 'Citrix') || contains(body_1, 'NetScaler')"
          - "content_length_2 == 11230664"
        condition: and