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CVE-2026-12108

MEDIUM 4.4 CVSS 3.1
Published
July 10, 2026
Last modified
July 10, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

Description

The Highlighting Code Block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 2.2.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • looswebstudio Highlighting Code Block — Up to and including 2.2.0

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb.php#L158
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb_menu.php#L23
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb_scripts.php#L69
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb.php#L158
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb_menu.php#L23
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb_scripts.php#L69
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?reponame=&old=3592103%40highlighting-code-block&new=3592103%40highlighting-code-block
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/166e1d3a-3fd9-4ab0-ba0d-707c6d59e0cd?source=cve
  • nvd.nist.gov Official NVD record