WordPress security changelog
MEDIUM CVE-2026-11363 Deferred

Ninja Forms deserializes untrusted action settings during form import

Ninja Forms through 3.14.6 deserializes untrusted input during form import. An Administrator or higher-privileged user can import a crafted form; WPN_Helper::build_nf_cache() immediately calls $action->get_settings(), triggering PHP object injection without a further action. The advisory identifies no usable POP chain in Ninja Forms itself. File deletion, sensitive-data retrieval, or code execution depends on a suitable chain in another installed plugin or theme.

CVE / CNA score 6.6 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Ninja Forms – The Contact Form Builder That Grows With You
Plugin slug
ninja-forms
Affected
<= 3.14.6
Safe version
3.14.7
Published
Sep 09, 2026
Weakness
CWE-502 — Deserialization of Untrusted Data

This CVE was published Sep 09, 2026 and is one of 74 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Ninja Forms to 3.14.7 or later. The official changelog identifies the matching fix. The checked current release is 3.15.3.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical 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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

References

Primary and upstream sources