Auth bypass in Mjdm Majordomo
CVE-2026-27181
MajorDoMo (aka Major Domestic Module) allows unauthenticated arbitrary module uninstallation through the market module. The market module's admin() method reads gr('mode') from $_REQUEST and assigns it to $this->mode at the start of execution, making all mode-gated code paths reachable without authentication via the /objects/?module=market endpoint. The uninstall mode handler calls uninstallPlugin(), which deletes module records from the database, executes the module's uninstall() method via eval(), recursively deletes the module's directory and template files using removeTree(), and removes associated cycle scripts. An attacker can iterate through module names and wipe the entire MajorDoMo installation with a series of unauthenticated GET requests.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.009 · change: +0.002
Affected products
- Mjdm Majordomo
- Sergejey Majordomo — versions 0
Weakness classification (CWE)
References
- chocapikk.com/posts/2026/majordomo-revisited/ (Exploit, Third Party Advisory, third-party-advisory)
- github.com/sergejey/majordomo/pull/1177 (issue-tracking, Exploit, patch, Issue Tracking)
- www.vulncheck.com/advisories/majordomo-unauthenticated-module-uninstall-via-mar… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-27181?
- CVE-2026-27181 is a high-severity vulnerability in Mjdm Majordomo, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-02-18.
- How severe is CVE-2026-27181?
- High severity. CVSS v3 base score is 7.5 out of 10.