CVE-2023-2023: The Custom 404 Pro WordPress plugin before 3.7.3 does not escape some URLs before outputting them in attribute

Q: How do I fix CVE-2023-2023?

custom 404 pro: upgrade to 3.7.3. Exact commands for each OS are on this page.

Q: Is CVE-2023-2023 being exploited?

CVE-2023-2023 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-2023-2023 affect?

CVE-2023-2023 affects custom 404 pro. Severity is medium (CVSS 6.1). 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.

Q: How urgent is CVE-2023-2023?

Priority 46/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2023-2023 is a medium-severity flaw (CVSS 6.1) affecting custom 404 pro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-05-30
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: kunalnagar

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

Am I affected?

Timeline

2023-05-30 08:15 UTCPublished CVE record published
2026-06-17 05:51 UTCUpdated Record last modified

kunalnagar custom 404 pro UPGRADE

Affected: < 3.7.3

Fixed in: 3.7.3

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 3.7.3 (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: Custom 404 Pro < 3.7.3 - Cross-Site Scripting

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-2023-2023?

custom 404 pro: upgrade to 3.7.3. Exact commands for each OS are on this page.

Is CVE-2023-2023 being exploited?

CVE-2023-2023 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-2023-2023 affect?

CVE-2023-2023 affects custom 404 pro. Severity is medium (CVSS 6.1). 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.

How urgent is CVE-2023-2023?

Priority 46/100. Public exploit reference

Software pages

WordPress vulnerabilities

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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
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References

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