CVE-2026-10818 WPForms Pro <= 1.10.1.1 - Unauthenticated Arbitrary File Write via Chunked Upload Init/Finalize Ordering
Unauthenticated attackers can upload executable files via chunked upload flaws, leading to remote code execution on sites using WPForms Pro.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-10818?
CVE-2026-10818 is a high-severity vulnerability in WPForms Pro, published on 25 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2026-10818?
How do I fix CVE-2026-10818?
No fix has been published for CVE-2026-10818 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-10818 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10818 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-g685-9q2w-88f4.