---
title: "CVE-2026-91827: Ninja Forms - Insecure Deserialization"
description: "Ninja Forms WordPress plugin 3.15.3 contains a PHP Object Injection caused by deserialization of user-submitted form field values during CSV export by administrators, letting unauthenticated attackers perform arbitrary file operations or remote code execution if a suitable POP chain exists."
url: https://panop.io/threat-heartbeat/CVE-2026-91827/
---

# CVE-2026-91827 Ninja Forms - Insecure Deserialization

Ninja Forms WordPress plugin 3.15.3 contains a PHP Object Injection caused by deserialization of user-submitted form field values during CSV export by administrators, letting unauthenticated attackers perform arbitrary file operations or remote code execution if a suitable POP chain exists.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.30% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91827)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution, File System Write

CVSS vector

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

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to the latest version of Ninja Forms.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91827](https://nvd.nist.gov/vuln/detail/CVE-2026-91827)
- [https://wpscan.com/vulnerability/7b279db2-92e0-4122-b5c6-aa12b7b01858/](https://wpscan.com/vulnerability/7b279db2-92e0-4122-b5c6-aa12b7b01858/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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