What is the CVSS score of CVE-2026-4883?

CVE-2026-4883 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Piotnet Forms are affected by CVE-2026-4883?

Piotnet Forms WordPress plugin contains a critical arbitrary file upload vulnerability affecting all versions through 2.1.40 that allows attackers without authentication to inject and execute…

Piotnet Forms CVE-2026-4883

EUVD-2026-30892 CRITICAL

Unrestricted Upload of File with Dangerous Type (CWE-434)

2026-05-19 Wordfence

GHSA-rpxv-q36f-v8r2

WordPress RCE File Upload

9.8

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

May 19, 2026 - 13:00 vuln.today

DescriptionNVD

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.

AnalysisAI

Arbitrary file upload in the Piotnet Forms WordPress plugin (all versions up to and including 2.1.40) allows unauthenticated remote attackers to upload dangerous file types such as .phar and .phtml, potentially leading to remote code execution on the underlying web server. The flaw stems from an incomplete extension blacklist in the piotnetforms_ajax_form_builder AJAX handler, and exploitation requires that a form on the site include a file upload field. …

RemediationAI

Within 24 hours: Deactivate and uninstall Piotnet Forms plugin from all WordPress instances; scan system logs for evidence of exploitation. Within 7 days: Audit all WordPress installations for plugin presence; review file upload directories for suspicious files (.phar, .phtml, .php); restore from clean backups if compromise is suspected. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-4883 vulnerability details – vuln.today

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Piotnet Forms CVE-2026-4883

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

Full analysis requires sign-in

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External POC / Exploit Code