Medium severity6.4NVD Advisory· Published Apr 18, 2026· Updated Apr 22, 2026
CVE-2026-4801
CVE-2026-4801
Description
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.
Affected products
2- Range: <=3.1.16
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
13- plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/changeset/3475789/coblocks/trunk/src/blocks/events/index.phpnvd
- plugins.trac.wordpress.org/changesetnvd
- www.wordfence.com/threat-intel/vulnerabilities/id/bde0aef3-aa61-4ee7-9cbf-9f51cb5ac700nvd
News mentions
1- Wordfence Intelligence Weekly WordPress Vulnerability Report (April 13, 2026 to April 19, 2026)Wordfence Blog · Apr 23, 2026