Ninja Forms - Excel Export <= 3.3.6 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Data Disclosure via 'spreadsheet_export_form_id' Parameter
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.
Browse WordPress security risksQuick answer
Ninja Forms - Excel Export should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- up to and including 3.3.6
Fixed versions
- 3.3.7
How to fix it
Ninja Forms - Excel Export is affected by CVE-2026-15159, an insecure direct object reference in Ninja Forms export. A subscriber can enumerate form IDs and download stored submissions that may contain personal data. Update Ninja Forms - Excel Export to 3.3.7 or a newer vendor-supported patched release. Prioritize exposed production systems and accounts that can reach the affected feature.
- Inventory every Ninja Forms - Excel Export deployment, version, exposed endpoint, environment, and owner.
- Confirm the installed release is not an affected version up to and including 3.3.6.
- Update Ninja Forms - Excel Export to 3.3.7 or a newer vendor-supported patched release.
- Until the update is complete, disable the Excel Export add-on or allow exports only for trusted administrators.
- Review relevant logs and look for subscribers enumerating spreadsheet_export_form_id, bulk XLSX downloads, and leftover export files.
- Delete exposed export files, revoke abused accounts, assess the scope of personal-data access, and follow the site's incident and notification process.
- Clear WordPress, object, page, CDN, and browser caches, then update the asset inventory and close any temporary controls only after validation.
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Verify the fix
- Confirm Ninja Forms - Excel Export is on the patched version or mitigation stated above and record the exact deployed version.
- Confirm a subscriber cannot export a form or submission set they are not allowed to access.
- Confirm the affected WordPress REST, AJAX, form, shortcode, upload, export, or admin feature is available only to the roles and requests that need it.
- Review logs after remediation for continued exploit attempts or signs that the issue was used before the fix.
- Rerun the relevant dependency, platform, vendor, or Fixnx security check and document the result, affected assets, change record, and cleanup evidence for CVE-2026-15159.
Related categories
Related security risks
More published guidance from the same primary category.
Ninja Forms - Excel Export <= 3.3.6 - Missing Authorization to Authenticated (Subscriber+) XLS Write via Path Traversal
Updated July 19, 2026
mediumNinja Forms - Excel Export <= 3.3.6 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'filter' Parameter
Updated July 19, 2026
mediumKirki <= 6.0.14 - Insecure Direct Object Reference to Unauthenticated Sensitive Information Disclosure via 'context' Parameter
Updated July 24, 2026
Trusted references
FAQ
What is affected by CVE-2026-15159?
Ninja Forms - Excel Export versions listed as affected should be reviewed: up to and including 3.3.6.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.