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Vulnerability record · CVE-2026-27177 · published 18 February 2026

CVE-2026-27177: Mjdm majordomo cross-site scripting vulnerability

Mjdm · Majordomo

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.

5.3 CVSS 4.0 Medium EPSS 0.35% · top 73.9% CWE-79 · Cross-site scripting
5.3CVSS 4.0 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://chocapikk.com/posts/2026/majordomo-revisited/ ExploitThird Party Advisory
https://github.com/sergejey/majordomo/pull/1177 ExploitIssue Tracking
https://www.vulncheck.com/advisories/majordomo-stored-cross-site-scripting-via-property-set-endpoint Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-50917Mjdm majordomo command injection vulnerabilityMajorDoMo (aka Major Domestic Module) before 0662e5e allows command execution via thumb.php shell metacharacters. NOTE: this is unrelated to the Majo…EPSS 38%9.3CVE-2026-27180Mjdm majordomo download of code without integrity check vulnerabilityMajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated remote code execution through supply chain compromise via update URL poisoning…EPSS 1.1%9.3CVE-2026-27174Mjdm majordomo code injection vulnerabilityMajorDoMo (aka Major Domestic Module) allows unauthenticated remote code execution via the admin panel's PHP console feature. An include order bug in…EPSS 5.1%9.2CVE-2026-27175Mjdm majordomo os command injection vulnerabilityMajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated OS command injection via rc/index.php. The $param variable from user input is …EPSS 7.0%8.8CVE-2026-27179Mjdm majordomo sql injection vulnerabilityMajorDoMo (aka Major Domestic Module) contains an unauthenticated SQL injection vulnerability in the commands module. The commands_search.inc.php fil…EPSS 0.63%8.7CVE-2026-27181Mjdm majordomo missing authorization vulnerabilityMajorDoMo (aka Major Domestic Module) allows unauthenticated arbitrary module uninstallation through the market module. The market module's admin() m…EPSS 0.94%5.3CVE-2026-27178Mjdm majordomo cross-site scripting vulnerabilityMajorDoMo (aka Major Domestic Module) contains a stored cross-site scripting (XSS) vulnerability through method parameter injection into the shoutbox…EPSS 0.40%5.1CVE-2026-27176Mjdm majordomo cross-site scripting vulnerabilityMajorDoMo (aka Major Domestic Module) contains a reflected cross-site scripting (XSS) vulnerability in command.php. The $qry parameter is rendered di…EPSS 0.60%

Source: NIST National Vulnerability Database (record CVE-2026-27177), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.