WPForms Pro <= 1.10.1.1 - Unauthenticated Arbitrary File Write via Chunked Upload Init/Finalize Ordering

2026-07-24 17:42

lhking

Strategic Overview

Status

Patched in 2.0.0

Affected PluginWPForms Pro

Affected Version<= 1.10.1.1

CVSS8.1High

CVECVE-2026-10818

View all WPForms Pro vulnerabilities

Vulnerability Overview

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.

Technical Analysis

REMEDIATION: Update to version 2.0.0, or a newer patched version --- IDENTIFIER: CWE-434 (Unrestricted Upload of File with Dangerous Type) The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

External References

https://www.cve.org/CVERecord?id=CVE-2026-10818 https://www.wordfence.com/threat-intel/vulnerabilities/id/b267f163-966a-43f7-8a7c-67d34c2c7e9d

CVSS Vector

8.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Base

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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