CVE-2026-15161: Ninja Forms - Excel Export <= 3.3.6 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'filter' Parameter
The Ninja Forms - Excel Export plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.3.6. This is due to the savefilter() AJAX handler storing the raw $POST['filter'] array into a WordPress option via updateoption() without any capability check, nonce verification, or input sanitization, combined with the getfilterrow() method on the admin Excel Export screen concatenating the stored filter values (fieldkey, condition, value) directly into HTML attributes without escattr(). This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Ninja Forms - Excel Exportto a version that resolves this vulnerability.Fixed in 3.3.6
Event History
Frequently Asked Questions
What is the severity of CVE-2026-15161?
The severity of CVE-2026-15161 is classified as medium with a score of 6.4.
How do I fix CVE-2026-15161?
To fix CVE-2026-15161, update the Ninja Forms - Excel Export plugin to the latest version beyond 3.3.6.
What type of vulnerability is associated with CVE-2026-15161?
CVE-2026-15161 is an authenticated stored cross-site scripting (XSS) vulnerability.
Who is affected by CVE-2026-15161?
Users of the Ninja Forms - Excel Export plugin for WordPress versions up to 3.3.6 are affected by CVE-2026-15161.
What can attackers achieve with CVE-2026-15161?
Attackers can potentially execute malicious scripts on behalf of authenticated users due to the stored XSS vulnerability in CVE-2026-15161.