CVE-2024-9204: The Smart Custom 404 Error Page plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via $_SER

Q: How do I fix CVE-2024-9204?

smart custom 404 error page: upgrade to 11.4.8. Exact commands for each OS are on this page.

Q: Is CVE-2024-9204 being exploited?

CVE-2024-9204 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-2024-9204 affect?

CVE-2024-9204 affects smart custom 404 error page. Severity is medium (CVSS 6.1). The Smart Custom 404 Error Page plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via $_SERVER['REQUEST_URI'] in all versions up to, and including, 11.4.7 due to insufficient input sanitization and output escaping. This m

Q: How urgent is CVE-2024-9204?

Priority 31/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2024-9204 is a medium-severity flaw (CVSS 6.1) affecting smart custom 404 error page. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Smart Custom 404 Error Page plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via $_SERVER['REQUEST_URI'] in all versions up to, and including, 11.4.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Why this priority

No elevated risk signals yet

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	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-10-04
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: nerdpress

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

Am I affected?

Timeline

2024-10-04 05:15 UTCPublished CVE record published
2026-06-17 08:24 UTCUpdated Record last modified

nerdpress smart custom 404 error page UPGRADE

Affected: < 11.4.8

Fixed in: 11.4.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy smart-custom-404-error-page || rpm -q smart-custom-404-error-page || smart-custom-404-error-page --version

2. UPGRADE to 11.4.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade smart-custom-404-error-page

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade smart-custom-404-error-page

Note

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

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-2024-9204?

smart custom 404 error page: upgrade to 11.4.8. Exact commands for each OS are on this page.

Is CVE-2024-9204 being exploited?

CVE-2024-9204 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-2024-9204 affect?

CVE-2024-9204 affects smart custom 404 error page. Severity is medium (CVSS 6.1). The Smart Custom 404 Error Page plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via $_SERVER['REQUEST_URI'] in all versions up to, and including, 11.4.7 due to insufficient input sanitization and output escaping. This m

How urgent is CVE-2024-9204?

Priority 31/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

References

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