CVE-2026-27178 MajorDoMo Stored Cross-Site Scripting via Method Parameters to Shoutbox
Unauthenticated attackers can inject scripts via shoutbox parameters, leading to session hijacking when administrators view the dashboard.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27178?
CVE-2026-27178 is a medium-severity cross-site scripting vulnerability in sergejey MajorDoMo, published on 18 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-27178?
It affects 1 product.
Products include Mjdm Majordomo.
How do I fix CVE-2026-27178?
No fix has been published for CVE-2026-27178 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-27178 being exploited?
There is no known exploitation of CVE-2026-27178 in the wild and no public exploit code.
Other vulnerabilities in sergejey MajorDoMo
- CVE-2023-50917 Command injection in n/a
- CVE-2026-27174 MajorDoMo Unauthenticated Remote Code Execution via Admin Console Eval
- CVE-2026-27180 MajorDoMo Supply Chain Remote Code Execution via Update URL Poisoning
- CVE-2026-27175 MajorDoMo Command Injection in rc/index.php via Race Condition
- CVE-2026-27179 MajorDoMo Unauthenticated SQL Injection in Commands Module
Sources
Also known as GHSA-5c8c-h849-76wx.