Vulnerability · Published Feb 18, 2026 · Assigned by VulnCheck

CVE-2026-27178MajorDoMo Stored Cross-Site Scripting via Method Parameters to Shoutbox

High 7.2

In plain English

A high-severity cross-site scripting in MajorDoMo from sergejey. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.3%top 81.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

MajorDoMo (aka Major Domestic Module) contains a stored cross-site scripting (XSS) vulnerability through method parameter injection into the shoutbox. The /objects/?method= endpoint allows unauthenticated execution of stored methods with attacker-controlled parameters. Default methods such as ThisComputer.VolumeLevelChanged pass the user-supplied VALUE parameter directly into the say() function, which stores the message raw in the shouts database table without escaping. The shoutbox widget renders stored messages without sanitization in both PHP rendering code and HTML templates. Because the dashboard widget auto-refreshes every 3 seconds, the injected script executes automatically when any administrator loads the dashboard, enabling session hijack through cookie exfiltration.

Affected products (as reported)

Vendor	Product	Versions
sergejey	MajorDoMo	0 – through *

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

MajorDoMo Revisited: What I Missed in 2023 third-party-advisory
Fix PR: sergejey/majordomo#1177 issue-tracking
VulnCheck Advisory: MajorDoMo Stored Cross-Site Scripting via Method Parameters to Shoutbox third-party-advisory