CVEs / CVE-2026-27175
CVE-2026-27175: sergejey MajorDoMo vulnerability
- critical 9.2 CVSS 4.0 (from the CNA)
- EPSS 23.6% chance of exploitation in the next 30 days, higher than 97% of CVEs (14 Nov 2026)
- Last changed at its sources
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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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| sergejey MajorDoMo | all versions | — |
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 13 Nov 2026.
Severity
| CVSS 4.0 | 9.2 criticalCVSS: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:XScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-78 |
References
- CVE-2026-27175 on NVD
- https://chocapikk.com/posts/2026/majordomo-revisited/ Exploit, Third Party Advisory
- https://github.com/sergejey/majordomo/pull/1177 Exploit, Issue Tracking
- https://www.vulncheck.com/advisories/majordomo-command-injection-in-rcindexphp-via-race-condition Third Party Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.