CVE-2026-4801
Page Builder Gutenberg Blocks <= 3.1.16 - Authenticated (Contributor+) Stored Cross-Site Scripting via External iCal Feed Data
CVSS Score
6.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | godaddy |
| Product | page builder gutenberg blocks – coblocks |
| Published | Apr 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
godaddy / Page Builder Gutenberg Blocks – CoBlocks
0 ≤ 3.1.16
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/bde0aef3-aa61-4ee7-9cbf-9f51cb5ac700?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L218 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L218 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L245 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L245 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L246 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L246 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L255 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L255 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L91 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L91 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/3475789/coblocks/trunk/src/blocks/events/index.php plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset?old_path=%2Fcoblocks/tags/3.1.16&new_path=%2Fcoblocks/tags/3.1.17
Credits
Fernando Mecozzi