Vulnerability · Published Feb 18, 2026 · Assigned by VulnCheck

CVE-2026-27177MajorDoMo Stored Cross-Site Scripting via Property Set Endpoint

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 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.2%top 86.3% 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 via the /objects/?op=set endpoint, which is intentionally unauthenticated for IoT device integration. User-supplied property values are stored raw in the database without sanitization. When an administrator views the property editor in the admin panel, the stored values are rendered without escaping in both a paragraph tag (SOURCE field) and a textarea element (VALUE field). The XSS fires on page load without requiring any click from the admin. Additionally, the session cookie lacks the HttpOnly flag, enabling session hijack via document.cookie exfiltration. An attacker can enumerate properties via the unauthenticated /api.php/data/ endpoint and poison any property with malicious JavaScript.

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 Property Set Endpoint third-party-advisory