CVE-2024-3559: The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post

Q: How do I fix CVE-2024-3559?

custom field suite: upgrade to newer than 2.6.7. Exact commands for each OS are on this page.

Q: Is CVE-2024-3559 being exploited?

CVE-2024-3559 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-2024-3559 affect?

CVE-2024-3559 affects custom field suite. Severity is medium (CVSS 6.4). The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post_content]' parameter versions up to, and including, 2.6.7 due to insufficient input sanitization and output escaping. This makes i

Q: How urgent is CVE-2024-3559?

Priority 29/100. No elevated risk signals yet.

Routine

MEDIUM 6.4UPGRADE

CVE-2024-3559 is a medium-severity flaw (CVSS 6.4) affecting custom field suite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post_content]' parameter versions up to, and including, 2.6.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-06-12
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: custom field suite project

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

Am I affected?

Timeline

2024-06-12 05:15 UTCPublished CVE record published
2026-06-17 07:44 UTCUpdated Record last modified

custom field suite project custom field suite UPGRADE

Affected: <= 2.6.7

Fixed in: newer than 2.6.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy custom-field-suite || rpm -q custom-field-suite || custom-field-suite --version

2. UPGRADE to newer than 2.6.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade custom-field-suite

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade custom-field-suite

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-2024-3559?

custom field suite: upgrade to newer than 2.6.7. Exact commands for each OS are on this page.

Is CVE-2024-3559 being exploited?

CVE-2024-3559 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-2024-3559 affect?

CVE-2024-3559 affects custom field suite. Severity is medium (CVSS 6.4). The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post_content]' parameter versions up to, and including, 2.6.7 due to insufficient input sanitization and output escaping. This makes i

How urgent is CVE-2024-3559?

Priority 29/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-3562 HIGH 8.8 UPGRADE The Custom Field Suite plugin for WordPress is vulnerable to PHP Code Injection in all versions up to, and inc
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CVE-2024-3558 MEDIUM 6.4 UPGRADE The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post
CVE-2024-3068 MEDIUM 4.4 UPGRADE The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'cfs[fields][
CVE-2024-0689 MEDIUM 4.4 UPGRADE The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via a meta import in

References

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