CVE-2021-24326: All 404 Redirect to Homepage < 1.21 - Authenticated Reflected Cross-Site Scripting (XSS)

Severity: medium (CVSS 5.4 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: 2021-05-17 · updated 2026-06-17
Weakness: CWE-79

Description

The tab parameter of the settings page of the All 404 Redirect to Homepage WordPress plugin before 1.21 was vulnerable to an authenticated reflected Cross-Site Scripting (XSS) issue as user input was not properly sanitised before being output in an attribute.

Affected products

All 404 Redirect to Homepage: before 1.21 — fixed in 1.21

How to fix

Upgrade to a fixed version: All 404 Redirect to Homepage 1.21. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/63d6ca03-e0df-40db-9839-531c13619094
https://wpscan.com/vulnerability/63d6ca03-e0df-40db-9839-531c13619094

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