Vulnerability · Published Oct 28, 2026 · Assigned by VulnCheck

CVE-2026-67187Ninja Forms WordPress Plugin < 3.15.4 Server-Side Validation Bypass via List Fields

High 7.1

In plain English

A high-severity security flaw in Ninja Forms from Saturday Drive. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.2%top 93.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Ninja Forms plugin for WordPress before 3.15.4 contains an incomplete server-side validation vulnerability that allows unauthenticated attackers to submit arbitrary values to Checkbox List, Multi-Select List, Image List, Country, and State fields because NF_Abstracts_List falls through to a validate() method that only checks required-field presence. Attackers can submit crafted formula payloads through the unauthenticated nf_ajax_submit endpoint that bypass CSV escaping applied only to Textbox and Textarea fields, resulting in CSV injection when an administrator downloads and opens the exported submissions file.

Affected products (as reported)

Vendor	Product	Versions
Saturday Drive	Ninja Forms	0 – before 3.15.4

Weakness: CWE-1236 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

References

WordPress Plugin Changelog release-notes, patch
VulnCheck Advisory: Ninja Forms WordPress Plugin < 3.15.4 Server-Side Validation Bypass via List Fields third-party-advisory