Ninja Forms Plugin up to 3.14.6 on WordPress build_nf_cache deserialization

Summaryinfo

A vulnerability was found in Ninja Forms Plugin up to 3.14.6. It has been rated as problematic. This vulnerability affects the function WPN_Helper::build_nf_cache. Performing a manipulation results in deserialization. This vulnerability is known as CVE-2026-11363. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Ninja Forms Plugin up to 3.14.6. It has been classified as problematic. This affects the function WPN_Helper::build_nf_cache. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-11363 since 06/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Name

• Ninja Forms Plugin

Version

• 3.14.0
• 3.14.1
• 3.14.2
• 3.14.3
• 3.14.4
• 3.14.5
• 3.14.6

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