Ninja Forms - Excel Export <= 3.3.6 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Data Disclosure via 'spreadsheet_export_form_id' Parameter
Strategic Overview
- Status
- Patched in 3.3.7
- Affected Plugin
- Ninja Forms - Excel Export
- Affected Version
<= 3.3.6- CVSS
- 4.3Medium
- Weakness type
- CWE-639 · Authorization Bypass Through User-Controlled Key
- CVE
CVE-2026-15159
At a glance
CVE-2026-15159 is a medium-severity Authorization Bypass Through User-Controlled Key vulnerability in the Ninja Forms - Excel Export WordPress plugin, affecting versions <= 3.3.6. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 3.3.7; sites on affected versions should update now. Disclosed July 2026, reported by Chu Thao Mai.
Vulnerability Overview
The Ninja Forms - Excel Export plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.3.6 via the 'spreadsheet_export_form_id' parameter due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to enumerate any Ninja Forms form ID and download all stored submission data — including names, email addresses, phone numbers, physical addresses, and any other PII collected by site forms — as a downloadable XLSX file.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-639: Authorization Bypass Through User-Controlled Key
Ninja Forms - Excel Export <= 3.3.6 carries this weakness at spreadsheet_export_form_id, and reaching it takes an account at Subscriber level or above. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.
Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. For Ninja Forms - Excel Export the fix is 3.3.7: builds <= 3.3.6 are affected, anything from 3.3.7 onward is not.
Remediation
Update to version 3.3.7, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Ninja Forms - Excel Export 3.3.7 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Ninja Forms - Excel Export
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