Known vulnerabilities in Urvanov Syntax Highlighter

Reincarnation of Crayon Syntax Highlighter. Syntax Highlighter supporting multiple languages, themes, fonts, highlighting from a URL, or post text.

1Reported vulnerabilities

5.4Highest CVSS score

2.9.1Latest version

3,000+Active installs

What to do now

Update Urvanov Syntax Highlighter to 2.8.34 or later. 1 of these have a fixed version available. Updating resolves them.

Plugin last updated: March 14, 2026 / Tested up to WordPress: 6.9.7 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2023-45106	Medium 5.4	0.2%	2.8.33 and earlier	`2.8.34`	October 6, 2023

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.