Vulnerability in shapedplugin Smart Post – Post Grid, Post Carousel, Post Slider Gutenberg Blocks for Blog & News

[ Description ]Official description

The Smart Post – Post Grid, Post Carousel, Post Slider Gutenberg Blocks for Blog & News plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'display_name' parameter in all versions up to, and including, 4.0.9 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the victim page to contain an Author Filter block alongside a grid or live-filter block, and execution is triggered by a visitor clicking the attacker's author entry in the dropdown — a standard filter interaction requiring no elevated privileges from the victim.

[ 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/post-carousel/tags/4.0.8/blocks/assets/js/script.js
• plugins.trac.wordpress.org/browser/post-carousel/tags/4.0.8/blocks/includes/class-templ…
• plugins.trac.wordpress.org/browser/post-carousel/tags/4.0.8/blocks/includes/class-templ…
• plugins.trac.wordpress.org/changeset/3775298/post-carousel
• plugins.trac.wordpress.org/changeset/3775298/post-carousel/trunk/blocks/assets/js/scrip…
• www.wordfence.com/threat-intel/vulnerabilities/id/a5612c16-9629-4869-8ec1-8fba788b7d7c