CVE-2026-12108
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.
Does this matter?
Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.4 MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Source
- security@wordfence.com
References
- https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb.php#L158
- https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb_menu.php#L23
- https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb_scripts.php#L69
- https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb.php#L158
- https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb_menu.php#L23
- https://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb_scripts.php#L69
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3592103%40highlighting-code-block&new=3592103%40highlighting-code-block
- https://www.wordfence.com/threat-intel/vulnerabilities/id/166e1d3a-3fd9-4ab0-ba0d-707c6d59e0cd?source=cve
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.