CVE-2026-27175MajorDoMo OS Command Injection
MajorDoMo Command Injection in rc/index.php via Race Condition
Published Feb 18, 2026 · Updated Nov 8, 2026
Key Facts
Patch immediately- CVE-2026-27175 is a critical-severity vulnerability (CVSS 9.2 v4) affecting MajorDoMo (Mjdm).
- It is exploited in the wild, listed in Industry KEV feed since Apr 13, 2026. Public exploit code is available.
- EPSS estimates a 24% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v4
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
EPSS (30-day exploit likelihood)
24%
Higher than 97.8% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
59/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Apr 13, 2026
54 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Advisories And Exploit References
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Apr 13, 2026 | n/a | Not reported |
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| MajorDoMoMjdm | See advisory | n/a |
Timeline
Publicly disclosed
Feb 18, 2026
Added to Industry KEV feed
Apr 13, 2026
Last updated
Nov 8, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
FAQ
Common Questions.
MajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated OS command injection via rc/index.php.
Affected: MajorDoMo (Mjdm). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Apr 13, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2026-27175 On Your Attack Surface?
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