Vulnerability · Published Feb 18, 2026 · Assigned by VulnCheck

CVE-2026-27175MajorDoMo Command Injection in rc/index.php via Race Condition

Critical 9.8

In plain English

A critical-severity OS command injection in MajorDoMo from sergejey. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 6.9% (higher than 94% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)6.9%top 5.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Metasploit

Official description

MajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated OS command injection via rc/index.php. The $param variable from user input is interpolated into a command string within double quotes without sanitization via escapeshellarg(). The command is inserted into a database queue by safe_exec(), which performs no sanitization. The cycle_execs.php script, which is web-accessible without authentication, retrieves queued commands and passes them directly to exec(). An attacker can exploit a race condition by first triggering cycle_execs.php (which purges the queue and enters a polling loop), then injecting a malicious command via the rc endpoint while the worker is polling. The injected shell metacharacters expand inside double quotes, achieving remote code execution within one second.

Affected products (as reported)

Vendor	Product	Versions
sergejey	MajorDoMo	0 – through *

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

MajorDoMo Revisited: What I Missed in 2023 third-party-advisory
Fix PR: sergejey/majordomo#1177 issue-tracking
VulnCheck Advisory: MajorDoMo Command Injection in rc/index.php via Race Condition third-party-advisory