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CVE-2026-4801

MEDIUM

6.4

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.

CVE Details

CVSS v3.1 Score6.4

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published4/18/2026

Last Modified4/22/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-79

References

https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L218(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L245(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L246(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L255(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L91(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L218(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L245(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L246(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L255(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L91(security@wordfence.com)

https://plugins.trac.wordpress.org/changeset/3475789/coblocks/trunk/src/blocks/events/index.php(security@wordfence.com)

https://plugins.trac.wordpress.org/changeset?old_path=%2Fcoblocks/tags/3.1.16&new_path=%2Fcoblocks/tags/3.1.17(security@wordfence.com)

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

IOC Correlations

No correlations recorded

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