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.
CVE-2026-12108
MEDIUMPre-NVD 4.44.4—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 4.4 from GitHub Security Advisory published 2026-07-10. a secondary CVSS source baseline 4.4; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.4Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.4
- EG Score
- 4.4(high)
- EPSS
- 10.9%
- KEV
- Not listed
Published
July 10, 2026
Last Modified
July 10, 2026
References (8)
- security@wordfencehttps://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb.php#L158
- security@wordfencehttps://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb_menu.php#L23
- security@wordfencehttps://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.1.3/class/loos_hcb_scripts.php#L69
- security@wordfencehttps://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb.php#L158
- security@wordfencehttps://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb_menu.php#L23
- security@wordfencehttps://plugins.trac.wordpress.org/browser/highlighting-code-block/tags/2.2.0/class/loos_hcb_scripts.php#L69
- security@wordfencehttps://plugins.trac.wordpress.org/changeset?reponame=&old=3592103%40highlighting-code-block&new=3592103%40highlighting-code-block
- security@wordfencehttps://www.wordfence.com/threat-intel/vulnerabilities/id/166e1d3a-3fd9-4ab0-ba0d-707c6d59e0cd?source=cve
Vendor Advisories for CVE-2026-12108(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 19× in last 7d / 19× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-15 21:31 UTCEG score recompute
- 2026-07-15 21:31 UTCGHSA enrichment
- 2026-07-15 02:00 UTCEPSS rescore
- 2026-07-14 23:25 UTCEG score recompute
- 2026-07-14 23:25 UTCGHSA enrichment
- 2026-07-14 01:20 UTCEG score recompute
- 2026-07-14 01:20 UTCGHSA enrichment
- 2026-07-13 22:30 UTCEPSS rescore
- 2026-07-13 06:12 UTCEPSS rescore
- 2026-07-13 03:13 UTCEG score recompute
- 2026-07-13 03:13 UTCGHSA enrichment
- 2026-07-12 05:46 UTCEPSS rescore
- 2026-07-12 05:06 UTCEG score recompute
- 2026-07-12 05:05 UTCGHSA enrichment
- 2026-07-11 08:27 UTCEPSS rescore
- 2026-07-11 06:59 UTCEG score recompute
- 2026-07-11 06:59 UTCGHSA enrichment
- 2026-07-10 08:52 UTCEG score recompute
- 2026-07-10 08:52 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-12108?
CVE-2026-12108 is a medium vulnerability published on July 10, 2026. 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…
When was CVE-2026-12108 disclosed?
CVE-2026-12108 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12108 actively exploited?
CVE-2026-12108 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12108?
CVE-2026-12108 has a CVSS v3 base score of 4.4 (NVD).
How do I remediate CVE-2026-12108?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12108, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-12108
Is Your Infrastructure Affected by CVE-2026-12108?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.