What’s Vulnerable › Vulnerabilities

CVE-2026-107764: SiteOrigin CSS <= 1.6.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment Author URL via Inspector href Sink

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-16
• Weakness: CWE-79

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

• gpriday SiteOrigin CSS: through 1.6.7

References

• https://github.com/siteorigin/so-css/compare/1.6.7...1.6.8
• 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://www.wordfence.com/threat-intel/vulnerabilities/id/b0ff9652-1b45-43d6-949a-92bfeaee96d3?source=cve

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