---
id: CVE-2026-107764
title: >-
  SiteOrigin CSS <= 1.6.7 - Unauthenticated Stored DOM-Based Cross-Site
  Scripting via Comment Author URL via Inspector href Sink
summary: >-
  The SiteOrigin CSS plugin for WordPress is vulnerable to Stored DOM-Based
  Cross-Site Scripting via the 'url (comment_author_url)' parameter in all
  versions up to, and including, 1.6.7 due to insufficient input sanitization
  and output esc…
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: gpriday
product: SiteOrigin CSS
affected:
  - siteorigin_css <= 1.6.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T14:30:01.805494Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T14:30:23.414Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-107764'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/b0ff9652-1b45-43d6-949a-92bfeaee96d3?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/js/inspector.js#L280
  - url: >-
      https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L69
  - url: >-
      https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L899
  - url: 'https://github.com/siteorigin/so-css/compare/1.6.7...1.6.8'
tags:
  - cve.org
epss: 0.00236
epssPercentile: 0.13601
ingestedAt: '2026-10-16T06:00:00.387Z'
---

## Overview

The SiteOrigin CSS plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'url (comment_author_url)' parameter in all versions up to, and including, 1.6.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is possible because WordPress core's esc_url() preserves HTML entity-encoded characters, allowing a crafted entity-encoded payload in the comment 'Website' field to survive storage and be DOM-decoded by the browser into executable markup at the sink.

## Affected

- `siteorigin_css <= 1.6.7`

## Remediation

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