WP Fastest Cache – WordPress Cache Plugin Security & Risk Analysis
wordpress.org/plugins/wp-fastest-cacheThe simplest and fastest WP Cache system
Is WP Fastest Cache – WordPress Cache Plugin Safe to Use in 2026?
Mostly Safe
Score 76/100WP Fastest Cache – WordPress Cache Plugin is generally safe to use. 35 past CVEs were resolved. Keep it updated.
The wp-fastest-cache plugin v1.4.6 presents a mixed security posture. While it demonstrates some good practices like a significant number of nonce and capability checks, concerns arise from the presence of unprotected AJAX handlers and a history of numerous vulnerabilities. The static analysis reveals a substantial attack surface with 8 out of 31 AJAX handlers lacking authentication checks, indicating a potential entry point for unauthorized actions. The use of `unserialize` is a critical red flag, as it can lead to severe security issues if not handled with extreme care and proper input validation. Furthermore, the low percentage of properly escaped output (21%) and prepared SQL statements (10%) suggests a higher risk of cross-site scripting (XSS) and SQL injection vulnerabilities respectively.
The plugin's vulnerability history is highly concerning, with 35 known CVEs, including 3 critical and 9 high-severity issues. The recurring types of vulnerabilities, such as SSRF, CSRF, missing authorization, path traversal, XSS, SQL injection, and RFI, point to systemic weaknesses in input validation and access control. The fact that all previously known vulnerabilities are currently patched is a positive sign, but the sheer volume and severity of past issues, with the last one being very recent (2025-11-26), suggest that the development team may struggle to maintain a consistently secure codebase. This history, combined with the identified code signals and attack surface, indicates that while immediate unpatched vulnerabilities are zero, the inherent risks associated with this version remain significant.
In conclusion, wp-fastest-cache v1.4.6 has notable strengths in its implementation of some security features. However, these are overshadowed by critical weaknesses such as unprotected AJAX endpoints, dangerous function usage, insufficient output escaping and SQL sanitization, and a historically problematic security track record. The potential for exploitation is heightened by these factors, and users should proceed with caution and ensure they are using the absolute latest version with all available patches applied. Continuous monitoring for new vulnerabilities is strongly advised.
Key Concerns
- Unprotected AJAX handlers found
- Use of dangerous function (unserialize)
- Low percentage of properly escaped output
- Low percentage of SQL using prepared statements
- High number of past critical/high severity CVEs
- History of common vulnerability types (SSRF, XSS, SQLi, etc.)
- Flows with unsanitized paths found
- High severity taint flow found
WP Fastest Cache – WordPress Cache Plugin Security Vulnerabilities
CVEs by Year
Severity Breakdown
35 total CVEs
WP Fastest Cache <= 1.4.0 - Missing Authorization to Authenticated (Subscriber+) DB Cleanup Actions
WP Fastest Cache <= 1.2.6 - Authenticated (Administrator+) Arbitrary File Deletion
WP Fastest Cache <= 1.2.1 - Unauthenticated SQL Injection
WP Fastest Cache <= 1.1.4 - Authenticated(Administrator+) Blind Server Side Request Forgery via check_url
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_preload_single_save_settings_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_clear_cache_of_allsites_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_start_cdn_integration_ajax_request_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_preload_single_callback'
WP Fastest Cache <= 1.1.2 - Missing Authorization in 'wpfc_purgecache_varnish_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_remove_cdn_integration_ajax_request_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'deleteCssAndJsCacheToolbar'
WP Fastest Cache <= 1.1.2 - Missing Authorization in 'wpfc_preload_single_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_pause_cdn_integration_ajax_request_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_toolbar_save_settings_callback'
WP Fastest Cache <= 1.1.2 - Missing Authorization to Cache Deletion
WP Fastest Cache <= 1.1.2 - Missing Authorization in 'deleteCssAndJsCacheToolbar'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'deleteCacheToolbar'
WP Fastest Cache <= 1.1.2 - Missing Authorization in 'wpfc_clear_cache_of_allsites_callback'
WP Fastest Cache <= 1.1.2 - Cross-Site Request Forgery via 'wpfc_purgecache_varnish_callback'
WP Fastest Cache <= 0.8.9.0 - Directory Traversal to Arbitrary File Deletion
WP Fastest Cache < 0.9.5 - Cross-Site Request Forgery to Stored Cross-Site Scripting
WP Fastest Cache < 0.9.5 - Authenticated (Subscriber+) SQL Injection
WP Fastest Cache <= 0.9.1.6 - Authenticated (Admin+) Directory Traversal to Arbitrary File Deletion
WP Fastest Cache <= 0.9.0.2 - Authenticated (Subscriber+) Arbitrary File Deletion
WP Fastest Cache <= 0.8.9.5 - Directory Traversal
WP Fastest Cache <= 0.8.8.5 - Cross-Site Request Forgery via page to wpfastestcacheoptions
WP Fastest Cache <= 0.8.8.5 - Cross-Site Scripting via rules[0][content] parameter
WP Fastest Cache <= 0.8.8.5 - Cross-Site Scripting via wpFastestCachePage options, wpFastestCachePreload_number or wpFastestCacheLanguage parameter
WP Fastest Cache <= 0.8.8.5 - Cross-Site Scripting via the rules[0][content] parameter in a wpfc_save_exclude_pages action
WP Fastest Cache <= 0.8.7.4 - SQL Injection
WP Fastest Cache <= 0.8.5.9 - Local File Inclusion
WP Fastest Cache <= 0.8.5.7 - Local File Inclusion
WP Fastest Cache <= 0.8.5.7 - Missing Authorization
WP Fastest Cache < 0.8.4.9 - SQL Injection
WP Fastest Cache < 0.8.3.5 - Multiple Cross-Site Request Forgery
WP Fastest Cache – WordPress Cache Plugin Code Analysis
Dangerous Functions Found
Bundled Libraries
SQL Query Safety
Output Escaping
Data Flow Analysis
WP Fastest Cache – WordPress Cache Plugin Attack Surface
AJAX Handlers 31
WordPress Hooks 59
Maintenance & Trust
WP Fastest Cache – WordPress Cache Plugin Maintenance & Trust
Maintenance Signals
Community Trust
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WP Fastest Cache – WordPress Cache Plugin Developer Profile
1 plugin · 1.0M total installs
How We Detect WP Fastest Cache – WordPress Cache Plugin
Patterns used to identify this plugin on WordPress sites during automated security audits and web crawling.
Asset Fingerprints
/wp-content/plugins/wp-fastest-cache/css/style.css/wp-content/plugins/wp-fastest-cache/js/wpfastestcache.js/wp-content/plugins/wp-fastest-cache/js/wpfastestcache.jswp-fastest-cache/css/style.css?ver=wp-fastest-cache/js/wpfastestcache.js?ver=HTML / DOM Fingerprints
wpfc-settings-tabsBEGIN WpFastestCacheEND WpFastestCacheBEGIN GzipWpFastestCacheEND GzipWpFastestCache+4 moredata-wpfc-noncewpFastestCachewpFastestCacheConfig/wp-json/wpfastestcache/v1/settings/wp-json/wpfastestcache/v1/cache/wp-json/wpfastestcache/v1/cdn