CVE-2026-39727: WC Fields Factory cross-site scripting (XSS) vulnerability
medium 6.5 affects latest 4.1.12 published 2026-10-06
- Affected versions
- 4.1.12 and older
- Fixed in
- no fix yet
- Latest version
- 4.1.12
- Severity
- Medium · CVSS 6.5
- Active installs
- 7,000+
- Type
- Cross-site scripting (XSS)
What an attacker needs
- Access: A low-level account on the site, such as a subscriber or customer (per the CVSS score).
- Interaction: It also needs someone on the site (often an admin) to click a link, open a page or submit a form the attacker prepared.
CVSS vector (score by Patchstack): CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
What to do now
- There is no fixed version yet. If you can manage without WC Fields Factory for now, deactivate and delete it until the developer ships a fix.
- If you must keep it, cut down who can log in (remove unused accounts, especially low-level ones, and turn off open registration) and put a web application firewall in front of the site.
- Check the WC Fields Factory page for a fix; it updates when the CVE feeds do.
- Not sure which version you run? Check your version against every known WC Fields Factory issue.
With WP-CLI:
wp plugin get wc-fields-factory --field=version. - If you ran an affected version and something looks off (new admin users, spam pages, redirects), run the free scan below.
The advisory
Subscriber Cross Site Scripting (XSS) in WC Fields Factory <= 4.1.12 versions.
References
- NVD CVE-2026-39727 nvd.nist.gov
- Patchstack advisory patchstack.com
Related
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Where this data comes from
- CVE record, score and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
- Versions and install counts: wordpress.org/plugins/wc-fields-factory (Plugins API), fetched 2026-11-04.
- The summary, “what an attacker needs” and “what to do” sections are our plain-English reading of the record and the plugin's release history; the quoted description is the record's own text. Spot an error? Email Daniel.