Vulnerability in themeum Kirki – Freeform Page Builder, Website Builder & Customizer

[ Description ]Official description

The Kirki – Freeform Page Builder, Website Builder & Customizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via registration metadata in all versions up to, and including, 6.3.1 This is due to insufficient escaping in `ExceptionalElements::image_element()`, which concatenates a user-meta value straight into an `<img src="…">` attribute. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute whenever a user accesses a page rendering a Kirki users collection whose image element is bound to one of the nine registration meta fields. Requires public user registration to be enabled and a published page carrying a `kirki-register` element, which prints the required element nonce into the public markup.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/ComponentLibrary/controller/CompLib…
• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/ComponentLibrary/controller/CompLib…
• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/ComponentLibrary/controller/CompLib…
• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/ComponentLibrary/controller/Element…
• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/includes/Frontend/Preview/Exception…
• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/includes/Frontend/Preview/Exception…
• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/includes/Frontend/Preview/Utils.php
• plugins.trac.wordpress.org/browser/kirki/tags/6.3.1/includes/HelperFunctions.php
• plugins.trac.wordpress.org/changeset/3718900/kirki/trunk/includes/Frontend/Preview/Exce…
• plugins.trac.wordpress.org/changeset
• www.wordfence.com/threat-intel/vulnerabilities/id/368001e9-3806-41d5-902e-0facf7fb31ff