Vulnerability · Published Oct 16, 2026 · Assigned by Wordfence
CVE-2026-107764SiteOrigin CSS <= 1.6.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment Author URL via Inspector href Sink
High 7.2
In plain English
A high-severity cross-site scripting in SiteOrigin CSS from gpriday. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| gpriday | SiteOrigin CSS | 0 – through 1.6.7 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/b0ff9652-1b45-43d6-949a-92bfeaee96d3?source=cve
- https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/js/inspector.js#L280
- https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L69
- https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L899
- https://github.com/siteorigin/so-css/compare/1.6.7...1.6.8