CVE-2026-27175
MajorDoMo Command Injection in rc/index.php via Race Condition
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
- sergejey · MajorDoMo
- CVSS v4.0 VULNCHECK
- 9.2 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 VULNCHECK
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 7.84% chance of exploitation in the next 30 days, 95th percentile
- Published
- 2026-02-18
- Updated
- 2026-06-23
Metasploit modules (1)
Security advisories
- https://chocapikk.com/posts/2026/majordomo-revisited
- https://www.vulncheck.com/advisories/majordomo-command-injection-in-rcindexphp-via-race-c…
- sergejey/majordomo/pull/1177