Stored DOM-based cross-site scripting in SiteOrigin CSS plugin
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The SiteOrigin CSS plugin for WordPress is affected up to and including 1.6.7. It does not sufficiently sanitize or escape the comment author URL input, so an unauthenticated attacker can store an entity-encoded script in the comment Website field (CWE-79). WordPress core's esc_url() preserves that encoding, and the browser decodes it into executable markup whenever a user opens an affected page.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for SiteOrigin CSS.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-16 Threatist record created from CVE-2026-107764
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: MEDIUM → LOW
- 2026-10-16 Alias added: GHSA-67h6-9gc5-xw7x
References
Other 5
- 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
More gpriday vulnerabilities
- TI-2026-02078 Page Builder by SiteOrigin <= 2.33.5 - Authenticated (Contributor+) Local File Inclusion CVSS 3.1HIGH 8.8
- TI-2020-10705 An issue was discovered in the SiteOrigin Page Builder plugin before 2.10.16 for… CVSS 3.1HIGH 8.8
- TI-2020-10704 An issue was discovered in the SiteOrigin Page Builder plugin before 2.10.16 for… CVSS 3.1HIGH 8.8
- TI-2024-36357 WordPress SiteOrigin Widgets Bundle plugin <= 1.64.0 - Broken Access Control vulnerability CVSS 3.1HIGH 8.8
- TI-2026-65918 SiteOrigin Widgets Bundle <= 1.73.2 - Authenticated (Contributor+) Local File Inclusion via 'theme' Parameter CVSS 3.1HIGH 7.5
- TI-2023-05778 so-widgets-bundle < 1.51.0 - Admin+ Local File Inclusion CVSS 3.1HIGH 7.2
Sources
- CVE-2026-107764 · CVE Program
- CVE-2026-107764 · NVD
- FIRST EPSS
- GHSA-67h6-9gc5-xw7x · GitHub Advisory Database · CC BY 4.0
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