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Medium severity · published Apr 18, 2026
CVE-2026-4801
Page Builder Gutenberg Blocks <= 3.1.16 - Authenticated (Contributor+) Stored Cross-Site Scripting via External iCal Feed Data
6.4
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PB
Page Builder Gutenberg Blocks – CoBlocks · godaddy
through 3.1.16 · source: vendor
Affected product
PB
Page Builder Gutenberg Blocks – CoBlocks
godaddy
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4801
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4801
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/tags/3.1.16/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#L246
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/tags/3.1.16/src/blocks/events/index.php#L91
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L218
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