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

Status: published. Published: 2026-10-28. Updated: 2026-11-03.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://wordpress.org/plugins/ninja-forms/#developers

## Affected products and versions

- Saturday Drive / Ninja Forms: ≥ 0; < 3.15.4 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.1 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L; source: CNA: VulnCheck

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.17% as of 2026-11-02; percentile 6.55%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-1236

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://wordpress.org/plugins/ninja-forms/#developers (CNA: VulnCheck; release-notes, patch)

- https://www.vulncheck.com/advisories/ninja-forms-wordpress-plugin-server-side-validation-bypass-via-list-fields (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-67187; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-67187; retrieved 2026-11-03; source updated Not reported

Revision: 05d27621119c36c2739c620f38f0bc8868871866f6120cfc1d71d9e007a5f4a8

Canonical: https://y2.dev/cve/CVE-2026-67187

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