SyntaxHighlighter Plus Security & Risk Analysis

wordpress.org/plugins/syntaxhighlighter-plus

Easily post source code such as PHP or HTML and display it in a styled box.

100 active installs v1.0b2 PHP + WP 2.0+ Updated Jun 3, 2010
codejavascriptphpsourcesourcecode
85
A · Safe
CVEs total0
Unpatched0
Last CVENever
Safety Verdict

Is SyntaxHighlighter Plus Safe to Use in 2026?

Generally Safe

Score 85/100

SyntaxHighlighter Plus has no known CVEs and is actively maintained. It's a solid choice for most WordPress installations.

No known CVEs Updated 15yr ago
Risk Assessment

The "syntaxhighlighter-plus" v1.0b2 plugin exhibits a generally good security posture based on the provided static analysis. The plugin has a notably small attack surface with no identified AJAX handlers, REST API routes, shortcodes, or cron events. Furthermore, all SQL queries utilize prepared statements, and there are no file operations or external HTTP requests, all of which are positive security indicators. The presence of nonce and capability checks is also a strength. However, a significant concern arises from the fact that 100% of the identified output operations are not properly escaped. This lack of output escaping represents a substantial risk for Cross-Site Scripting (XSS) vulnerabilities, as user-supplied data, if not sanitized before display, could be executed as JavaScript in the browser of other users or administrators. The vulnerability history is clean, with no known CVEs, which suggests a positive track record for this plugin, but this should not overshadow the critical flaw found in output handling.

Key Concerns

  • Unescaped output detected
Vulnerabilities
None known

SyntaxHighlighter Plus Security Vulnerabilities

No known vulnerabilities — this is a good sign.
Version History

SyntaxHighlighter Plus Release Timeline

v1.0b1
v1.0b2Current
v0.18
v0.17
v0.16
v0.15
v0.15a
v0.15b
v0.14
v0.13
v0.12
v0.11
v0.10
Code Analysis
Analyzed Mar 16, 2026

SyntaxHighlighter Plus Code Analysis

Dangerous Functions
0
Raw SQL Queries
0
0 prepared
Unescaped Output
7
0 escaped
Nonce Checks
1
Capability Checks
2
File Operations
0
External Requests
0
Bundled Libraries
0

Output Escaping

0% escaped7 total outputs
Attack Surface

SyntaxHighlighter Plus Attack Surface

Entry Points0
Unprotected0
WordPress Hooks 15
actioninitsyntaxhighlighter.php:39
actionwp_headsyntaxhighlighter.php:40
actionadmin_headsyntaxhighlighter.php:41
actionwp_footersyntaxhighlighter.php:42
actionadmin_footersyntaxhighlighter.php:43
actionadmin_menusyntaxhighlighter.php:46
filterthe_contentsyntaxhighlighter.php:49
filterwidget_textsyntaxhighlighter.php:50
filtercontent_save_presyntaxhighlighter.php:53
filtercontent_save_presyntaxhighlighter.php:54
actionadmin_headsyntaxhighlighter.php:55
actionupdate_option_widget_textsyntaxhighlighter.php:56
filterformat_to_editsyntaxhighlighter.php:57
filtercontent_save_presyntaxhighlighter.php:60
filterthe_editor_contentsyntaxhighlighter.php:61
Maintenance & Trust

SyntaxHighlighter Plus Maintenance & Trust

Maintenance Signals

WordPress version tested
Last updatedJun 3, 2010
PHP min version
Downloads40K

Community Trust

Rating100/100
Number of ratings1
Active installs100
Developer Profile

SyntaxHighlighter Plus Developer Profile

Fred Wu

1 plugin · 100 total installs

84
trust score
Avg Security Score
85/100
Avg Patch Time
30 days
View full developer profile
Detection Fingerprints

How We Detect SyntaxHighlighter Plus

Patterns used to identify this plugin on WordPress sites during automated security audits and web crawling.

Asset Fingerprints

Asset Paths
/wp-content/plugins/syntaxhighlighter-plus/syntaxhighlighter/styles/shCore.css/wp-content/plugins/syntaxhighlighter-plus/syntaxhighlighter/styles/shThemeDefault.css
Script Paths
/wp-content/plugins/syntaxhighlighter-plus/syntaxhighlighter/scripts/shCore.js/wp-content/plugins/syntaxhighlighter-plus/syntaxhighlighter/scripts/shAutoloader.js
Version Parameters
syntaxhighlighter-plus/syntaxhighlighter/styles/shCore.css?ver=syntaxhighlighter-plus/syntaxhighlighter/styles/syntaxhighlighter-plus/syntaxhighlighter/scripts/shCore.js?ver=syntaxhighlighter-plus/syntaxhighlighter/scripts/shAutoloader.js?ver=

HTML / DOM Fingerprints

CSS Classes
syntaxhighlightersyntaxhighlighter-overflowsyntaxhighlighter-wrapper
HTML Comments
START SyntaxHighlighter core END SyntaxHighlighter core START SyntaxHighlighter theme END SyntaxHighlighter theme+2 more
Data Attributes
data-syntaxhighlight
JS Globals
SyntaxHighlighter
Shortcode Output
[sourcecode language="[/sourcecode][source language="[/source]
FAQ

Frequently Asked Questions about SyntaxHighlighter Plus