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.

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/bde0aef3-aa61-4ee7-9cbf-9f51cb5ac700?source=cve

https://plugins.trac.wordpress.org/changeset?old_path=%2Fcoblocks/tags/3.1.16&new_path=%2Fcoblocks/tags/3.1.17

https://plugins.trac.wordpress.org/changeset/3475789/coblocks/trunk/src/blocks/events/index.php

https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L91

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#L246

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#L218

https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L91

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#L246

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#L218

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3