What’s Vulnerable › Vulnerabilities
CVE-2026-91827: Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-22 · updated 2026-09-22
- Weakness: CWE-502
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.
Affected products
- kstover Ninja Forms – The Contact Form Builder That Grows With You: from 3.15.3 before 3.15.4 — fixed in 3.15.4
How to fix
Upgrade to a fixed version: kstover Ninja Forms – The Contact Form Builder That Grows With You 3.15.4. Check the vendor advisory for mitigations.
References
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