CVE-2026-4801

The Page Builder Gutenberg Blocks – CoBlocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via external iCal feed data in all versions up to, and including, 3.1.16 due to insufficient output escaping of event titles, descriptions, and locations fetched from external iCal feeds in the Events block rendering function. 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.

The following products are affected by CVE-2026-4801 vulnerability.

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Here, you will find a curated list of external links that provide in-depth information to CVE-2026-4801.

URL	Resource
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L218
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L245
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L246
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L255
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L91
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L218
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L245
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L246
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L255
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L91
https://plugins.trac.wordpress.org/changeset/3475789/coblocks/trunk/src/blocks/events/index.php
https://plugins.trac.wordpress.org/changeset?old_path=%2Fcoblocks/tags/3.1.16&new_path=%2Fcoblocks/tags/3.1.17
https://www.wordfence.com/threat-intel/vulnerabilities/id/bde0aef3-aa61-4ee7-9cbf-9f51cb5ac700?source=cve