---
id: CVE-2026-107764
title: >-
  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…
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'
cwe:
  - CWE-79
vendor: gpriday
product: SiteOrigin CSS
affected:
  - siteorigin_css <= 1.6.7
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:17:05.660'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107764'
references:
  - url: 'https://github.com/siteorigin/so-css/compare/1.6.7...1.6.8'
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/js/inspector.js#L280
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L69
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L899
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/b0ff9652-1b45-43d6-949a-92bfeaee96d3?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
epss: 0.00236
epssPercentile: 0.14558
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T14:30:01.805494Z'
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.

## Remediation

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