CVE-2021-4407: The Custom Banners plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and inc

Q: How do I fix CVE-2021-4407?

custom banners: upgrade to newer than 3.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-4407 being exploited?

CVE-2021-4407 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-2021-4407 affect?

CVE-2021-4407 affects custom banners. Severity is medium (CVSS 4.3). The Custom Banners plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.2.2 This is due to missing or incorrect nonce validation on the saveCustomFields() function. This makes it possible for

Q: How urgent is CVE-2021-4407?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2021-4407 is a medium-severity flaw (CVSS 4.3) affecting custom banners. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Custom Banners plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.2.2 This is due to missing or incorrect nonce validation on the saveCustomFields() function. This makes it possible for unauthenticated attackers to save custom fields via a forged request granted they can trick a site administrator 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	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-352
Published	2023-07-12
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: goldplugins

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

Am I affected?

Timeline

2023-07-12 04:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

goldplugins custom banners UPGRADE

Affected: <= 3.2.2

Fixed in: newer than 3.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy custom-banners || rpm -q custom-banners || custom-banners --version

2. UPGRADE to newer than 3.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade custom-banners

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade custom-banners

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-2021-4407?

custom banners: upgrade to newer than 3.2.2. Exact commands for each OS are on this page.

Is CVE-2021-4407 being exploited?

CVE-2021-4407 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-2021-4407 affect?

CVE-2021-4407 affects custom banners. Severity is medium (CVSS 4.3). The Custom Banners plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.2.2 This is due to missing or incorrect nonce validation on the saveCustomFields() function. This makes it possible for

How urgent is CVE-2021-4407?

Priority 23/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-8799 MEDIUM 6.1 UPGRADE The Custom Banners plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_

References

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