What’s Vulnerable › Vulnerabilities

CVE-2026-4801: Page Builder Gutenberg Blocks <= 3.1.16 - Authenticated (Contributor+) Stored Cross-Site Scripting via External iCal Feed Data

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-18 · updated 2026-06-17
• Weakness: CWE-79

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

• godaddy Page Builder Gutenberg Blocks – CoBlocks: through 3.1.16

References

• 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

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