PT-2026-33588 · Godaddy · The Page Builder Gutenberg Blocks – Coblocks

Fernando Mecozzi · Published 2026-04-18 · Updated 2026-04-18 · CVE-2026-4801

NVD

CVSS v3.1

6.4

Medium

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-4801

Affected Products

The Page Builder Gutenberg Blocks – Coblocks

References · 14

• https://nvd.nist.gov/vuln/detail/CVE-2026-4801 · Security Note
• https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L245 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L255 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L218 · Note
• https://plugins.trac.wordpress.org/changeset/3475789/coblocks/trunk/src/blocks/events/index.php · Note
• https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L246 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L218 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L255 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L245 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/bde0aef3-aa61-4ee7-9cbf-9f51cb5ac700?source=cve · Note
• https://plugins.trac.wordpress.org/changeset?old_path=%2Fcoblocks/tags/3.1.16&new_path=%2Fcoblocks/tags/3.1.17 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L91 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L246 · Note
• https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L91 · Note