CVE-2026-18488CWE-79cross-site-scripting

CVE-2026-18488

Medium · published September 1, 2026

CVSS v3.1
6.4
EPSS
0%
Percentile
24.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00329 · 24.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-01T10:16Z
References (11)
https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/framework/features/blocks/dynamic-data/block.php#L183 · [email protected]https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/framework/features/blocks/dynamic-data/views/wp-field.php#L448 · [email protected]https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/framework/features/blocks/dynamic-data/views/wp-field.php#L487 · [email protected]https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/static/js/editor/blocks/dynamic-data/block.json#L7 · [email protected]https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/framework/features/blocks/dynamic-data/block.php#L183 · [email protected]https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/framework/features/blocks/dynamic-data/views/wp-field.php#L448 · [email protected]https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/framework/features/blocks/dynamic-data/views/wp-field.php#L487 · [email protected]https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/static/js/editor/blocks/dynamic-data/block.json#L7 · [email protected]https://plugins.trac.wordpress.org/changeset/3636709/blocksy-companion/trunk/framework/features/blocks/dynamic-data/views/wp-field.php · [email protected]https://plugins.trac.wordpress.org/changeset?old_path=%2Fblocksy-companion/tags/2.1.51&new_path=%2Fblocksy-companion/tags/2.1.52 · [email protected]https://www.wordfence.com/threat-intel/vulnerabilities/id/e0d0adcc-6741-4cab-aaba-df356691a1ee?source=cve · [email protected]
EPSS history
Timeline
  • 02 SEP 03:34Z
    EPSS moved — → 0%
    epss
  • 01 SEP 05:30Z
    Blocksy Companion <= 2.1.51 - Authenticated (Author+) Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data)
    cvelistv5