CVE-2024-39646: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Cu

Q: How do I fix CVE-2024-39646?

custom 404 pro: upgrade to 3.11.2. Exact commands for each OS are on this page.

Q: Is CVE-2024-39646 being exploited?

CVE-2024-39646 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-39646 affect?

CVE-2024-39646 affects custom 404 pro. Severity is high (CVSS 7.1). Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Custom 404 Pro custom-404-pro.This issue affects Custom 404 Pro: from n/a through <= 3.11.1.

Routine

HIGH 7.1UPGRADE

CVE-2024-39646 is a high-severity flaw (CVSS 7.1) affecting custom 404 pro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Custom 404 Pro custom-404-pro.This issue affects Custom 404 Pro: from n/a through <= 3.11.1.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-08-01
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: kunalnagar

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-08-01 23:15 UTCPublished CVE record published
2026-06-17 07:42 UTCUpdated Record last modified

kunalnagar custom 404 pro UPGRADE

Affected: < 3.11.2

Fixed in: 3.11.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy custom-404-pro || rpm -q custom-404-pro || custom-404-pro --version

2. UPGRADE to 3.11.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade custom-404-pro

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade custom-404-pro

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: WordPress Custom 404 Pro <= 3.11.1 - Reflected XSS

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-39646?

custom 404 pro: upgrade to 3.11.2. Exact commands for each OS are on this page.

Is CVE-2024-39646 being exploited?

CVE-2024-39646 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-39646 affect?

CVE-2024-39646 affects custom 404 pro. Severity is high (CVSS 7.1). Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Custom 404 Pro custom-404-pro.This issue affects Custom 404 Pro: from n/a through <= 3.11.1.

How urgent is CVE-2024-39646?

Priority 37/100. High severity

Related CVEs

CVE-2023-51540 HIGH 7.1 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Na
CVE-2023-32740 MEDIUM 5.8 UPGRADE Unauth
CVE-2023-2032 CRITICAL 9.8 UPGRADE The Custom 404 Pro WordPress plugin before 3.8.1 does not properly sanitize database inputs, leading to multip

References

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