CVE-2026-27175 json
MajorDoMo Command Injection in rc/index.php via Race Condition
published 2026-02-18 8 mo ago modified 2026-11-08 24 h ago also EUVD-2026-7930
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 6.9%
- EPSS 6.9% chance of exploitation in 30 days, percentile 94%
- public exploits
- 1
- Metasploit
Summary
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.
Patch / fix
- github.com/sergejey/majordomo#1177 pull request
Timeline
- First public exploit (Metasploit exploit/multi/http/majordomo_cmd_injection_rce)
- Published
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 8 mo ago
Exploit prediction
6.90% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit exploit/multi/http/majordomo_cmd_injection_rce MajorDoMo Remote Command Injection via cycle_execs Race Condition metasploit exploit, excellent rank, 2026-02-18
- github.com https://github.com/sergejey/majordomo/pull/1177 referenced PoC, tagged "exploit" by a source, unverified
- chocapikk.com https://chocapikk.com/posts/2026/majordomo-revisited/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.2 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.2 | 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 |
Affected products
- sergejey MajorDoMo
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
github.com
/sergejey/majordomo/pull/1177
issue-tracking, patch, exploit
-
chocapikk.com
/posts/2026/majordomo-revisited/
third-party-advisory, exploit
-
vulncheck.com
/advisories/majordomo-command-injection-in-rcindexphp-via-race-condition
third-party-advisory
Sources
- CVE List CVE-2026-27175
- NVD CVE-2026-27175
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