CVE-2023-51540 - CVE House

Status published High CVE-2023-51540

WordPress Custom 404 Pro Plugin <= 3.10.0 is vulnerable to Cross Site Scripting (XSS)

7.1 CVSS

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2023-51540

Check My Exposure

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Kyle Sanchez (Patchstack Alliance)

References

https://patchstack.com/database/vulnerability/custom-404-pro/wordpress-custom-404-pro-plugin-3-10-0-cross-site-scripting-xss-vulnerability?_s_id=cve

More from Kunal Nagar

View All →

CVE-2023-32740

WordPress Custom 404 Pro Plugin <= 3.8.1 is vulnerable to Cross Site Scripting (XSS)

Medium 5.8

CVE-2022-47605

WordPress Custom 404 Pro Plugin <= 3.7.0 is vulnerable to SQL Injection (SQLi)

High 8.3

Affected Vendor

Kunal Nagar

View all reports →

Affected Software

Custom 404 Pro

Vulnerable Versions:

Unknown

Timeline

Official Publish: February 1st, 2024

Last Modified: April 28th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise

Initial Access

T1059.007 JavaScript

Execution

T1539 Steal Web Session Cookie

Collection

T1213 Data from Information Repositories