Strategic Overview
- Status
- Patched in 1.3.1
- Affected Plugin
- Redirect 404 to parent
- Affected Version
< 1.3.1- CVSS
- 6.1Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-24286
At a glance
CVE-2021-24286 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Redirect 404 to parent WordPress plugin, affecting versions < 1.3.1. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.3.1; sites on affected versions should update now. Disclosed April 2021, reported by 0xB9.
Vulnerability Overview
The settings page of the Redirect 404 to parent WordPress plugin before 1.3.1 did not properly sanitise the tab parameter before outputting it back, leading to a reflected Cross-Site Scripting issue
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Redirect 404 to parent < 1.3.1 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Redirect 404 to parent the fix is 1.3.1: builds < 1.3.1 are affected, anything from 1.3.1 onward is not.
Remediation
Update to version 1.3.1, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Redirect 404 to parent: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Redirect 404 to parent 1.3.1 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
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