CVE-2026-12108

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.

PUBLISHED Reserved 2026-06-12 | Published 2026-07-10 | Updated 2026-07-10 | Assigner Wordfence

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Timeline

Credits

Chinnapak Charoensiri finder

References

www.wordfence.com/...-3fd9-4ab0-ba0d-707c6d59e0cd?source=cve

plugins.trac.wordpress.org/.../tags/2.2.0/class/loos_hcb.php

plugins.trac.wordpress.org/.../2.2.0/class/loos_hcb_menu.php

plugins.trac.wordpress.org/...2.0/class/loos_hcb_scripts.php

plugins.trac.wordpress.org/.../tags/2.1.3/class/loos_hcb.php

plugins.trac.wordpress.org/.../2.1.3/class/loos_hcb_menu.php

plugins.trac.wordpress.org/...1.3/class/loos_hcb_scripts.php

plugins.trac.wordpress.org/...2103%40highlighting-code-block

cve.org (CVE-2026-12108)

nvd.nist.gov (CVE-2026-12108)

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