PatchTheCVECVE-2026-27175: MajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated OS command injection via rc/index.php
CVE-2026-27175 is a critical-severity flaw (CVSS 9.8) affecting majordomo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 pa
Why this priority
- Critical severity
- EPSS top 6%: very likely to be exploited
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 6.9% (top 6%) |
| CISA exploited list | No |
| Weakness | CWE-78 |
| Published | 2026-02-18 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: chocapikk.com/posts/2026/majordomo-revisited/
- Write-up: github.com/sergejey/majordomo/pull/1177
- Metasploit: MajorDoMo Remote Command Injection via cycle_execs Race Condition
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-27175?
majordomo: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-27175 being exploited?
CVE-2026-27175 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-27175 affect?
CVE-2026-27175 affects majordomo. Severity is critical (CVSS 9.8). 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 escapeshel
How urgent is CVE-2026-27175?
Priority 71/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action
Software pages
Related CVEs
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