What is CVE-2024-3558?

CVE-2024-3558 is a medium-severity vulnerability in Custom Field Suite Project, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2024-06-20.

How severe is CVE-2024-3558?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Is CVE-2024-3558 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Custom Field Suite Project

CVE-2024-3558

The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post_title]' 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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2024-06-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Custom Field Suite Project
Mgibbs189 Custom Field Suite — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

www.wordfence.com/threat-intel/vulnerabilities/id/8e4dc6fd-4bd5-4ed1-ade0-cf2f8… (Third Party Advisory)
github.com/mgibbs189/custom-field-suite/blob/963dfcede18ff4ad697498556d9058db07… (Product)
github.com/mgibbs189/custom-field-suite/blob/963dfcede18ff4ad697498556d9058db07… (Product)
github.com/mgibbs189/custom-field-suite/blob/963dfcede18ff4ad697498556d9058db07… (Product)
github.com/WordPress/WordPress/blob/22d95abc55824e83904dc0fef290464b6bec7708/wp… (Product)
en-gb.wordpress.org/plugins/custom-field-suite/ (Product)
mgibbs189.github.io/custom-field-suite/ (Exploit)
core.trac.wordpress.org/ticket/56655 (Issue Tracking)

Frequently asked questions

What is CVE-2024-3558?: CVE-2024-3558 is a medium-severity vulnerability in Custom Field Suite Project, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2024-06-20.
How severe is CVE-2024-3558?: Medium severity. CVSS v3 base score is 6.4 out of 10.
Is CVE-2024-3558 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.