EUVD-2026-71880
GHSA-4g6m-8fw6-3c27
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Unauthenticated network attack writes files to web root; AC:L as add-on is environmental; C:L/I:L reflects changed-scope browser impact per standard stored-XSS S:C scoring.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Ninja Forms - The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Repeater Child 'type' Confusion via Unmatched Array Key in all versions up to, and including, 3.15.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the Ninja Forms File Uploads add-on to be active, as the attack routes the unwhitelisted child entry through the File Uploads handler to write an attacker-supplied HTML file containing arbitrary JavaScript into any web-server-writable directory, including the site root, where it is served from the site's own origin.
AnalysisAI
Stored XSS with on-disk file write capability in the Ninja Forms WordPress plugin (versions ≤3.15.1) allows unauthenticated remote attackers to plant attacker-controlled HTML/JavaScript files anywhere in the web server's writable directory tree - including the site root - when the separately-installed Ninja Forms File Uploads add-on is active. The attack exploits a 'type' confusion flaw in Repeater child field processing: an unrecognized array key causes the submission pipeline to misroute input through the File Uploads handler, which writes raw attacker-supplied content to disk where it is subsequently served from the site's own origin. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two simultaneous conditions: (1) Ninja Forms plugin version ≤3.15.1 is installed and active on the WordPress site, and (2) the Ninja Forms File Uploads add-on (a separately installed, paid extension) is also installed and active - without this add-on, the File Uploads handler code path does not exist and the vulnerability is unreachable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 7.2 (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N) correctly reflects unauthenticated, low-complexity network exploitation but likely understates real-world impact: writing arbitrary JavaScript to the web root enables full session hijacking, credential harvesting, admin account compromise, and persistent backdoor placement - effects that substantially exceed the C:L/I:L ratings on the changed (victim browser) scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Ninja Forms to version 3.15.2, which contains the confirmed fix per the WordPress.org SVN changeset at https://plugins.trac.wordpress.org/changeset?reponame=&new=3674413%40ninja-forms%2Ftags%2F3.15.2&old=3663678%40ninja-forms%2Ftags%2F3.15.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all WordPress installations running Ninja Forms versions ≤3.15.1 with the File Uploads add-on; begin staged updates to version 3.15.2 or later in a test environment. …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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