What’s Vulnerable › Vulnerabilities

CVE-2023-2023: Custom 404 Pro < 3.7.3 - Reflected Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-05-30 · updated 2026-06-17
• Weakness: CWE-79

Description

The Custom 404 Pro WordPress plugin before 3.7.3 does not escape some URLs before outputting them in attributes, leading to Reflected Cross-Site Scripting.

Affected products

• Kunal Nagar Custom 404 Pro: before 3.7.3 — fixed in 3.7.3

How to fix

Upgrade to a fixed version: Kunal Nagar Custom 404 Pro 3.7.3. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/8859843a-a8c2-4f7a-8372-67049d6ea317
• https://wpscan.com/vulnerability/8859843a-a8c2-4f7a-8372-67049d6ea317

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