CVE-2026-91827
High
Description
The Ninja Forms WordPress plugin 3.15.3 does not prevent user-submitted form field values from being deserialised when an administrator later exports form submissions to CSV, allowing unauthenticated attackers to perform PHP Object Injection; if a suitable POP chain is present via another installed plugin or theme, this can lead to actions such as arbitrary file operations or remote code execution.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Ninja Forms
PublishedSep 22, 2026
First seenSep 22, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- Ninja Forms3.15.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Ninja Forms | 3.15.3 ≤ v < 3.15.4 | 3.15.4 |
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