What is CVE-2026-27175?

CVE-2026-27175 is a critical-severity vulnerability in Sergejey Majordomo, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-02-18.

How severe is CVE-2026-27175?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-27175 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Sergejey Majordomo

CVE-2026-27175

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 escapeshe…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.260 (96.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Sergejey Majordomo — versions 0

Weakness classification (CWE)

CWE-78 — OS Command Injection

Public proof-of-concept exploits

rapid7/metasploit-framework

References

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

Frequently asked questions

What is CVE-2026-27175?: CVE-2026-27175 is a critical-severity vulnerability in Sergejey Majordomo, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-02-18.
How severe is CVE-2026-27175?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-27175 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.