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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.

PUBLISHED Reserved 2026-02-18 | Published 2026-02-18 | Updated 2026-02-20 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unknown

Any version
affected

Credits

Valentin Lobstein finder

References

chocapikk.com/posts/2026/majordomo-revisited/ (MajorDoMo Revisited: What I Missed in 2023) third-party-advisory

github.com/sergejey/majordomo/pull/1177 (Fix PR: sergejey/majordomo#1177) patch

www.vulncheck.com/...pting-via-method-parameters-to-shoutbox (VulnCheck Advisory: MajorDoMo Stored Cross-Site Scripting via Method Parameters to Shoutbox) third-party-advisory

cve.org (CVE-2026-27178)

nvd.nist.gov (CVE-2026-27178)

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