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TI-2026-04257 Aliases CVE-2026-4883GHSA-rpxv-q36f-v8r2

Piotnet Forms <= 2.1.40 - Unauthenticated Arbitrary File Upload via Form File Upload

Priority MEDIUM 54CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03063 87th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PiotnetPiotnet Formsup to 2.1.40—No fix listedCNA
  • Piotnet Forms VendorPiotnet Affected up to 2.1.40 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4883
  2. 2026-10-03 Alias added: GHSA-rpxv-q36f-v8r2

References

Other 2

  • TI-2026-04258 Piotnet Addons for Elementor Pro <= 7.1.70 - Unauthenticated Arbitrary File Upload via Form File Upload CVSS 3.1CRITICAL 9.8
  • TI-2023-05713 Piotnet Forms <= 1.0.28 - Unauthenticated Arbitrary File Upload CVSS 3.1CRITICAL 9.8
  • TI-2026-22531 WordPress Piotnet Addons For Elementor Pro plugin <= 7.1.67 - Arbitrary File Upload vulnerability CVSS 3.1CRITICAL 9.6
  • TI-2023-28066 WordPress Piotnet Forms Plugin <= 1.0.25 is vulnerable to Arbitrary File Upload CVSS 3.1CRITICAL 9.8
  • TI-2024-22215 Cross-site scripting in Piotnet Addons For Elementor Pro CVSS 3.1CRITICAL 9.8
  • TI-2024-22219 WordPress Piotnet Addons For Elementor Pro plugin <= 7.1.17 - Unauthenticated Arbitrary Post/Page Deletion vulnerability CVSS 3.1HIGH 7.5
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences