Stored Cross-Site Scripting in Blocksy Companion Plugin for WordPress
CVE-2026-18488

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Blocksy Companion
Vendor
CVE Published:
1 September 2026

What is CVE-2026-18488?

The Blocksy Companion plugin for WordPress is susceptible to a Stored Cross-Site Scripting vulnerability affecting all versions up to and including 2.1.51. This occurs due to inadequate input sanitization and output escaping related to the 'tagName' Block Attribute (blocksy/dynamic-data). Authenticated attackers with author-level access can exploit this vulnerability to inject arbitrary scripts into affected pages, which will execute when users access those pages, potentially compromising user security.

Affected Version(s)

Blocksy Companion 0 <= 2.1.51

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:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

haofanjiukunle
.