Stored Cross-Site Scripting Vulnerability in Blocksy Companion Plugin for WordPress
CVE-2026-12430

4.4MEDIUM

Key Information:

Vendor

WordPress
Status
Blocksy Companion
Vendor
CVE Published:
19 June 2026

What is CVE-2026-12430?

The Blocksy Companion plugin for WordPress has a vulnerability that allows stored cross-site scripting (XSS) due to inadequate input sanitization and output escaping in admin settings. This flaw affects all versions up to and including 2.1.45 and is particularly concerning for multi-site installations where the 'unfiltered_html' option is disabled. Authenticated attackers with editor-level permissions or higher can exploit this vulnerability by injecting malicious web scripts into pages, which will execute when a user accesses those compromised pages.

Affected Version(s)

Blocksy Companion 0 <= 2.1.45

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/blocksy-compan...
https://plugins.trac.wordpress.org/browser/blocksy-compan...

CVSS V3.1

Score:
4.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Pasindu Dilshan
.