CVE-2026-107764CWE-79cross-site-scripting

CVE-2026-107764

High · published October 16, 2026

CVSS v3.1
7.2
EPSS
0%
Percentile
13.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00236 · 13.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-16T10:17Z
References (5)
https://github.com/siteorigin/so-css/compare/1.6.7...1.6.8 · [email protected]https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/js/inspector.js#L280 · [email protected]https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L69 · [email protected]https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L899 · [email protected]https://www.wordfence.com/threat-intel/vulnerabilities/id/b0ff9652-1b45-43d6-949a-92bfeaee96d3?source=cve · [email protected]
EPSS history
Timeline
  • 17 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 16 OCT 05:30Z
    SiteOrigin CSS <= 1.6.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment Author URL via Inspector href Sink
    cvelistv5
  • 16 OCT 05:30Z
    SiteOrigin CSS <= 1.6.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment Author URL via Inspector href Sink
    cvelistv5