CVE-2026-27180
CWE-494Published: February 18, 2026· Updated: Feb 20, 2026
Official Description
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.
Risk Analysis
This critical vulnerability in MajorDoMo allows unauthenticated remote code execution through supply chain compromise via update URL poisoning. An attacker can manipulate the system update URL and trigger a forced update, leading to arbitrary code execution on the server. The CVSS score of 9.8 indicates maximum severity and ease of exploitation.
A proof-of-concept exploit is publicly available, and the vulnerability is remotely exploitable with low attack complexity. There is no evidence of active exploitation in the wild.
Upgrade MajorDoMo to a patched version that addresses the authentication bypass and update mechanism vulnerabilities. Ensure that update URLs are properly validated and TLS verification is enabled for all downloads.
Technical Analysis
CVE-2026-27180 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
A proof-of-concept (PoC) exploit exists for CVE-2026-27180. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (3)
Quick Facts
Related CVEs (CWE-494)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-27180 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts