CVE-2023-51540 HIGH

CVE-2023-51540: WordPress Custom 404 Pro Plugin <= 3.10.0 is vulnerable to Cross Site Scripting (XSS)

Vendor Kunal Nagar

Product Custom 404 Pro

Weakness CWE-79 · XSS

Published February 1, 2024

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

7.1/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Nagar Custom 404 Pro allows Stored XSS.This issue affects Custom 404 Pro: from n/a through 3.10.0.

Explanation of Vulnerability in Simple Terms

02Summary

Custom 404 Pro through version 3.10.0 contains a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into web pages. The vulnerability requires user interaction—typically clicking a malicious link—and can affect multiple users or sessions. An attacker can steal session cookies, redirect users, or deface page content.

What an attacker can do

03Attacker Capabilities

Inject malicious JavaScript that runs in visitors' browsers, stealing cookies or redirecting users to phishing sites.

Potential impact on your site

04Site Impact

Visitors to your site could be compromised; their session tokens or credentials may be stolen by attackers.

Conditions required to exploit

05Prerequisites

Attacker crafts a malicious URL and tricks a site visitor into clicking it; no authentication required.

Key dates

06Disclosure timeline

February 1, 2024 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2023-51540 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html AskarLabs — CWE-79 write-up Cross-Site Scripting

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