CVE-2026-87870

Deferred Deferred - Pending Action

Stored XSS in Ninja Forms Scheduled Exports WordPress Plugin

Publication date: 2026-09-10

Last updated on: 2026-09-11

Assigner: Wordfence

Description

The Ninja Forms - Scheduled Exports plugin for WordPress is vulnerable to Stored Cross-Site Scripting via REST API Parameters (interval, format, emailTo) in all versions up to, and including, 3.0.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level privileges and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The REST endpoint is registered without a permission_callback and only validates a nonce without checking user capabilities.

CVSS Scores

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Meta Information

Published

2026-09-10

Last Modified

2026-09-11

Generated

2026-09-30

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-29

NVD

CVE-2026-87870

EUVD

EUVD-2026-75230

Affected Vendors & Products

Vendor	Product	Version / Range
ninja_forms	scheduled_exports	to 3.0.3 (inc)

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 - Scheduled Exports WordPress plugin. It allows authenticated attackers with subscriber-level access or higher to inject malicious scripts via REST API parameters (interval, format, emailTo). The scripts execute when users access infected pages due to insufficient input sanitization and output escaping.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Ninja Forms - Scheduled Exports plugin up to version 3.0.3. Check for suspicious scripts in pages or REST API responses. Review user roles with subscriber-level access or higher for unauthorized activity. Use security plugins to scan for stored XSS payloads in form exports or email content.

Impact Analysis

An attacker could steal user sessions, redirect to malicious sites, or perform actions on behalf of users. Since the vulnerability requires only subscriber-level access, it lowers the barrier for exploitation compared to higher-privilege attacks.

Compliance Impact

Stored XSS could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles. For HIPAA, it may risk protected health information exposure if user sessions are hijacked.

Mitigation Strategies

Immediately update the Ninja Forms - Scheduled Exports plugin to the latest version. Remove or disable the plugin if updates are unavailable. Restrict subscriber-level user privileges to minimize attack surface. Monitor for unusual script injections in exported files or emails.

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