CVE-2026-110899

Deferred Deferred - Pending Action

Stored XSS in Ninja Forms WordPress Plugin

Publication date: 2026-10-21

Last updated on: 2026-10-21

Assigner: Patchstack

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kevin Stover Ninja Forms ninja-forms allows Stored XSS.This issue affects Ninja Forms: from n/a through 3.15.5.

CVSS Scores

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Meta Information

Published

2026-10-21

Last Modified

2026-10-21

Generated

2026-11-10

AI Q&A

2026-10-22

EPSS Evaluated

2026-11-09

NVD

CVE-2026-110899

EUVD

EUVD-2026-107137

Affected Vendors & Products

Vendor	Product	Version / Range
Kevin Stover	Ninja Forms	0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Ninja Forms plugin for WordPress. It allows attackers to inject malicious scripts into web pages that are stored on the server and executed when other users view those pages. The flaw exists due to improper neutralization of user input during web page generation.

Detection Guidance

Detecting this vulnerability requires checking for outdated versions of Ninja Forms. Inspect WordPress plugins via the admin dashboard or use commands like 'wp plugin list' in WP-CLI to verify the installed version. Compare it against version 3.15.5.

Impact Analysis

An attacker could exploit this to steal user session cookies, redirect users to malicious sites, or perform actions on behalf of users. Website visitors could have their accounts compromised or sensitive data exposed if the injected script captures keystrokes or form inputs.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection. Organizations may face fines or penalties if user data is compromised due to inadequate security measures.

Mitigation Strategies

Immediately update Ninja Forms to the latest version. If an update is unavailable, consider disabling the plugin temporarily until a patch is released. Regularly audit plugins for vulnerabilities.

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