Is Varnish Working? Security & Risk Analysis

wordpress.org/plugins/is-varnish-working

Test your wordpress url to see if it contains the Varnish Cache HTTP headers

10 active installs v1.0.2 PHP + WP 3.0.1+ Updated Jun 29, 2021
is-varnish-workingtest-varnishvarnishvarnish-cache
85
A · Safe
CVEs total0
Unpatched0
Last CVENever
Safety Verdict

Is Is Varnish Working? Safe to Use in 2026?

Generally Safe

Score 85/100

Is Varnish Working? has no known CVEs and is actively maintained. It's a solid choice for most WordPress installations.

No known CVEs Updated 4yr ago
Risk Assessment

The "is-varnish-working" plugin version 1.0.2 exhibits a generally good security posture based on the static analysis. There are no detected AJAX handlers, REST API routes, shortcodes, or cron events, resulting in a zero-point attack surface, which is excellent. Furthermore, the absence of dangerous functions, external HTTP requests, and file operations, coupled with 100% of SQL queries using prepared statements, indicates robust development practices in these critical areas. The plugin also has no recorded vulnerability history, which suggests a history of secure development or a lack of discovered issues.

However, the static analysis does reveal a significant concern regarding output escaping. With only 33% of outputs properly escaped out of six total, there is a notable risk of cross-site scripting (XSS) vulnerabilities. This lack of proper sanitization on a portion of its output points can expose users to malicious code injection if user-supplied data is not handled carefully before being displayed. While the overall attack surface is minimal and there are no known historical vulnerabilities, the unescaped output represents a tangible and specific risk that needs to be addressed.

Key Concerns

  • Low percentage of properly escaped output
Vulnerabilities
None known

Is Varnish Working? Security Vulnerabilities

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

Is Varnish Working? Release Timeline

v1.0.2Current
v1.0.1
v1.0.0
Code Analysis
Analyzed Mar 17, 2026

Is Varnish Working? Code Analysis

Dangerous Functions
0
Raw SQL Queries
0
0 prepared
Unescaped Output
4
2 escaped
Nonce Checks
0
Capability Checks
0
File Operations
0
External Requests
0
Bundled Libraries
0

Output Escaping

33% escaped6 total outputs
Attack Surface

Is Varnish Working? Attack Surface

Entry Points0
Unprotected0
WordPress Hooks 3
actionadmin_menuis-varnish-working.php:34
actionadmin_initis-varnish-working.php:35
actionadmin_enqueue_scriptsis-varnish-working.php:254
Maintenance & Trust

Is Varnish Working? Maintenance & Trust

Maintenance Signals

WordPress version tested5.7.15
Last updatedJun 29, 2021
PHP min version
Downloads1K

Community Trust

Rating0/100
Number of ratings0
Active installs10
Developer Profile

Is Varnish Working? Developer Profile

Oliver Whysall

1 plugin · 10 total installs

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

How We Detect Is Varnish Working?

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

Asset Fingerprints

HTML / DOM Fingerprints

CSS Classes
wrapperboxheadersListalertalert-danger
Data Attributes
id="api_error"id="api_test_form"id="api_test"id="api_response_varnish"id="api_response_cache"id="api_response_other"+2 more
JS Globals
jQuery
FAQ

Frequently Asked Questions about Is Varnish Working?