Vulnerability Report

CVE-2026-4883

RCE

Title: Piotnet Forms Arbitrary File Upload leading to RCE

RCE

Proof Of Concept

PoC Available for CVE-2026-4883

CWE Category CWE-434

Published Date May 19, 2026

Modified Date May 19, 2026

Exploit Status Available

Score 9.8 CVSS v3.1

Exploit Probability (EPSS)

0.81%

Vulnerability Summary

CVE-2026-4883: The Piotnet Forms plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the 'piotnetforms_ajax_form_builder' function in all versions up to, and including, 2.1.40. The plugin uses an incomplete extension blacklist that only blocks php, phpt, php5, php7, and exe extensions, while allowing dangerous extensions such as .phar or .phtml to be uploaded. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. Note: The exploit can only be exploited if a file field is added to the form.

Impacted Vendors

Analysis in Progress...

Reference Links

https://piotnetforms.com https://www.wordfence.com/threat-intel/vulnerabilities/id/9bd9c9db-d279-4de2-b5e4-ac7d8c919f2a?source=cve

CVSS v3.1

Source Entity [email protected]

Severity CRITICAL

9.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-4883 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/xShadow-Here/CVE-2026-4883

View Code

May 19, 2026 MODIFIED

Vulnerability data updated via NVD.

May 19, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.