Arbitrary file upload in Wpazleen Simpleform – Form Maker To Chat Apps With Quiz, Poll And Multi Lead Notifications

CVE-2026-118235

The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.10.2 via the handle_upload function. This is due to missing server-side file key allowlist and pre-sanitization extension derivation that allows a trailing-dot filename to bypass all extension and MIME validation in handle_upload. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The only access control is a nonce that is printed into every public form's data-nonce attribute, making it trivially obtainable by any unauthenticated visitor on a page embedding the form shortcode.

Vulnerability class: Unrestricted File Upload

Published .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (54.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-118235?
CVE-2026-118235 is a critical-severity vulnerability in Wpazleen Simpleform – Form Maker To Chat Apps With Quiz, Poll And Multi Lead Notifications, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-10-31.
How severe is CVE-2026-118235?
Critical severity. CVSS v3 base score is 9.8 out of 10.