CVE-2026-11363 Ninja Forms <= 3.14.6 - Authenticated (Administrator+) PHP Object Injection via Form Import

Q: What is CVE-2026-11363?

CVE-2026-11363 is a medium-severity unsafe deserialization vulnerability in kstover Ninja Forms – The Contact Form Builder That Grows With You, published on 9 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Medium 6.6 Published 9 Sep 2026 Updated 9 Sep 2026

Administrators can trigger PHP object injection via form import, potentially leading to code execution or data access if a POP chain exists.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-11363?

CVE-2026-11363 is a medium-severity unsafe deserialization vulnerability in kstover Ninja Forms – The Contact Form Builder That Grows With You, published on 9 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

The Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.14.6 via deserialization of untrusted input . This makes it possible for authenticated attackers, with administrator-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present. The deserialization is triggered automatically during form import when WPN_Helper::build_nf_cache() invokes $action->get_settings() immediately after the crafted form is imported, requiring no further interaction beyond the import action itself.

Weakness: CWE-502

Which versions are affected by CVE-2026-11363?

How do I fix CVE-2026-11363?

No fix has been published for CVE-2026-11363 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2026-11363 being exploited?

There is no known exploitation of CVE-2026-11363 in the wild and no public exploit code.

Sources

Also known as GHSA-7jv8-f84m-pq5j.