CVE-2026-39755: WP Duplicate arbitrary file upload vulnerability
critical 9.9 affects latest 1.1.11 published 2026-10-06
- Affected versions
- 1.1.11 and older
- Fixed in
- no fix yet
- Latest version
- 1.1.11
- Severity
- Critical · CVSS 9.9
- Active installs
- 200+
- Type
- Arbitrary file upload
What an attacker needs
- Access: A low-level account on the site, such as a subscriber or customer (per the CVSS score).
CVSS vector (score by Patchstack): CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
What to do now
- There is no fixed version yet. If you can manage without WP Duplicate 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 WP Duplicate page for a fix; it updates when the CVE feeds do.
- Not sure which version you run? Check your version against every known WP Duplicate issue.
With WP-CLI:
wp plugin get local-sync --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 Arbitrary File Upload in WP Duplicate <= 1.1.11 versions.
References
- NVD CVE-2026-39755 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/local-sync (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.