---
id: CVE-2026-27177
title: MajorDoMo Stored Cross-Site Scripting via Property Set Endpoint
summary: >-
  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
  stor…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: sergejey
product: MajorDoMo
affected:
  - MajorDoMo <= *
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-02-20T19:27:30.071976Z'
published: '2026-02-18'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:01:40.339Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-27177'
references:
  - url: 'https://chocapikk.com/posts/2026/majordomo-revisited/'
    label: 'MajorDoMo Revisited: What I Missed in 2023'
  - url: 'https://github.com/sergejey/majordomo/pull/1177'
    label: 'Fix PR: sergejey/majordomo#1177'
  - url: >-
      https://www.vulncheck.com/advisories/majordomo-stored-cross-site-scripting-via-property-set-endpoint
    label: >-
      VulnCheck Advisory: MajorDoMo Stored Cross-Site Scripting via Property Set
      Endpoint
tags:
  - cve.org
epss: 0.00229
epssPercentile: 0.13732
ingestedAt: '2026-11-08T14:51:22.466Z'
---

## Overview

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

- `MajorDoMo <= *`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.