MajorDoMo Reflected Cross-Site Scripting in command.php

published 2026-02-18 8 mo ago modified 2026-11-08 25 h ago also EUVD-2026-8388

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known, plus a Nuclei check

MajorDoMo (aka Major Domestic Module) contains a reflected cross-site scripting (XSS) vulnerability in command.php. The $qry parameter is rendered directly into the HTML page without sanitization via htmlspecialchars(), both in an input field value attribute and in a paragraph element. An attacker can inject arbitrary JavaScript by crafting a URL with malicious content in the qry parameter.

Patch / fix

links 1

github.com/sergejey/majordomo#1177 pull request

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 8 mo ago (2026-02-20)

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template MajorDoMo - Cross-Site Scripting nuclei detection template
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	5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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-79 Improper Neutralization of Input During Web Page Generation

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-reflected-cross-site-scripting-in-commandphp
third-party-advisory

Sources

CVE List CVE-2026-27176
NVD CVE-2026-27176

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary