WPForms Pro chunk finalization permits unauthenticated executable uploads
WPForms Pro through 1.10.1.1 lets an unauthenticated request reach ajax_chunk_upload_finalize, where chunk metadata and contents are written to disk before the assembled file's type is validated. When validation fails, the assembled file is not removed, allowing an attacker to leave a file that may be executable by the web server and potentially obtain remote code execution. The CNA record does not disclose the request route, action name or chunk parameter names.
- Component
- WPForms Pro
- Plugin slug
wpforms-pro- Affected
- <= 1.10.1.1
- Safe version
1.10.2- Published
- Jul 25, 2026
This CVE was published Jul 25, 2026 and is one of 2 known issues for this plugin.
Update, patch or deactivate.
Update WPForms Pro to 1.10.2 or later. The affected-version record ends at 1.10.1.1 and the vendor's next published release is 1.10.2. Remove rejected or unexpected files from WPForms temporary-upload locations and review web-server logs if a vulnerable release was publicly reachable.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The WPForms Pro plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.10.1.1 via the ajax_chunk_upload_finalize function. This is due to the file type validation occurring after chunk metadata and file contents have already been written to disk, and the assembled file not being deleted upon validation failure. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.
CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H