What is CVE-2026-18488?

CVE-2026-18488 is a medium-severity vulnerability in Creativethemeshq Blocksy Companion, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-09-01.

How severe is CVE-2026-18488?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Creativethemeshq Blocksy Companion

CVE-2026-18488

The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) in all versions up to, and including, 2.1.51 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Creativethemeshq Blocksy Companion

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-18488?: CVE-2026-18488 is a medium-severity vulnerability in Creativethemeshq Blocksy Companion, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-09-01.
How severe is CVE-2026-18488?: Medium severity. CVSS v3 base score is 6.4 out of 10.