CVE-2026-4801
Medium
Low
Medium
High
Critical
6.4
CVSS Score
Vulnerability 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 Metrics
Common Vulnerability Scoring System
Vector String:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack Vector
N
Attack Complexity
L
Privileges Required
L
User Interaction
N
Scope
C
Confidentiality
L
Integrity
L
Availability
N
References & Resources
-
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L218security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L245security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L246security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L255security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/tags/3.1.16/src/blocks/events/index.php#L91security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L218security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L245security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L246security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L255security@wordfence.com
-
https://plugins.trac.wordpress.org/browser/coblocks/trunk/src/blocks/events/index.php#L91security@wordfence.com
-
https://plugins.trac.wordpress.org/changeset/3475789/coblocks/trunk/src/blocks/events/index.phpsecurity@wordfence.com
-
https://plugins.trac.wordpress.org/changeset?old_path=%2Fcoblocks/tags/3.1.16&new_path=%2Fcoblocks/tags/3.1.17security@wordfence.com
-
https://www.wordfence.com/threat-intel/vulnerabilities/id/bde0aef3-aa61-4ee7-9cbf-9f51cb5ac700?source=cvesecurity@wordfence.com
Severity Details
6.4
out of 10.0
Medium
Weakness Type (CWE)
CWE-79
Top 25 #1
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Description
- The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
- Exploit Likelihood
- High
- Typical Severity
- Medium
- OWASP Top 10
- A03:2021-Injection
- Abstraction Level
- Base
Key Information
- Published Date
- April 18, 2026
