CVE-2024-39646: WordPress Custom 404 Pro plugin <= 3.11.1 - Reflected Cross Site Scripting (XSS) vulnerability

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-08-01 · updated 2026-06-17
Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Custom 404 Pro custom-404-pro.This issue affects Custom 404 Pro: from n/a through <= 3.11.1.

Affected products

Kunal Nagar Custom 404 Pro: before 3.11.2 — fixed in 3.11.2

How to fix

Upgrade to a fixed version: Kunal Nagar Custom 404 Pro 3.11.2. Check the vendor advisory for mitigations.

References

https://patchstack.com/database/Wordpress/Plugin/custom-404-pro/vulnerability/wordpress-custom-404-pro-plugin-3-11-1-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve

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