Post Snippets <= 4.2.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Summary

The Post Snippets – Custom WordPress Code Snippets Customizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 4.2.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Entity-encoded payloads such as &lt;script&gt;...&lt;/script&gt; survive WordPress's wp_kses_post on-save sanitization because kses does not decode HTML entities, and are only converted back into executable HTML tags at render time by the plugin's own shortcode filter. This requires snippet shortcodes to be enabled.

Timeline

1. Oct 28, 2026, 6:45 AM UTCCVE published
2. Oct 28, 2026, 6:54 AM UTCFirst seen by cve.now
3. Oct 29, 2026, 1:33 AM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

4. Oct 29, 2026, 1:41 AM UTCRecord last updated

Affected versions

• saadiqbal Post Snippets – Custom WordPress Code Snippets Customizer

  through 4.2.4

References 10