CVE-2026-27178
Received Received - Intake

Stored XSS in MajorDoMo Shoutbox Enables Admin Session Hijack

Publication date: 2026-02-18

Last updated on: 2026-02-20

Assigner: VulnCheck

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.

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Meta Information

Published
2026-02-18
Last Modified
2026-02-20
Generated
2026-07-06
AI Q&A
2026-02-19
EPSS Evaluated
2026-07-05
NVD
CVE-2026-27178
EUVD
EUVD-2026-8375

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mjdm majordomo *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The vulnerability in MajorDoMo is a stored cross-site scripting (XSS) issue caused by method parameter injection into the shoutbox feature. An attacker can use the /objects/?method= endpoint to execute stored methods without authentication, injecting malicious scripts through user-controlled parameters. These scripts are stored raw in the database and rendered without sanitization in the dashboard's shoutbox widget, which auto-refreshes every 3 seconds. This allows the injected script to execute automatically when an administrator views the dashboard.

Impact Analysis

This vulnerability can lead to session hijacking by enabling attackers to steal administrator cookies through the injected scripts. Since the dashboard widget auto-refreshes frequently, the malicious script executes repeatedly, potentially compromising administrator accounts and allowing unauthorized access to the system.

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