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CVE-2026-27180

MajorDoMo Supply Chain Remote Code Execution via Update URL Poisoning

Published
Last modified
published
Not listed in CISA KEV
1 Metasploit module, 1 proof of concept on GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

MajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated remote code execution through supply chain compromise via update URL poisoning. The saverestore module exposes its admin() method through the /objects/?module=saverestore endpoint without authentication because it uses gr('mode') (which reads directly from $_REQUEST) instead of the framework's $this->mode. An attacker can poison the system update URL via the auto_update_settings mode handler, then trigger the force_update handler to initiate the update chain. The autoUpdateSystem() method fetches an Atom feed from the attacker-controlled URL with trivial validation, downloads a tarball via curl with TLS verification disabled (CURLOPT_SSL_VERIFYPEER set to FALSE), extracts it using exec('tar xzvf ...'), and copies all extracted files to the document root using copyTree(). This allows an attacker to deploy arbitrary PHP files, including webshells, to the webroot with two GET requests.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • sergejey MajorDoMo

    All versions

References 5

chocapikk.com

GitHub · sergejey/majordomo

vulncheck.com

GitHub · rapid7/metasploit-framework

GitHub · mbanyamer/CVE-2026-27180-MajorDoMo-unauthenticated-RCE