EUVD-2026-46267
GHSA-895j-583x-29ww
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network submission (PR:N/AV:N/AC:L), payload requires an admin to view submissions (UI:R), and execution in the privileged admin context crosses a trust boundary (S:C) enabling account takeover (C:H/I:H).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
Ninja Forms plugin for WordPress versions 3.10.4 through 3.14.9 contains an unauthenticated stored cross-site scripting vulnerability in the Repeatable Fieldset feature where parseSubmissionIndex() accepts arbitrary strings as submission indexes without numeric validation, and admin_form_element() interpolates the index directly into HTML without escaping. An unauthenticated attacker can submit a public form with a crafted repeater child key containing malicious script payloads, which execute in an administrator's browser when viewing submissions in the WordPress admin panel, enabling session-cookie theft, creation of administrator accounts, installation of malicious plugins, and arbitrary modification of site content.
Articles & Coverage 2
AnalysisAI
Stored cross-site scripting in the Ninja Forms WordPress plugin (versions 3.10.4 through 3.14.9) lets unauthenticated visitors persist script payloads through the Repeatable Fieldset feature that later execute in an administrator's browser when they review form submissions. Because it requires no authentication and fires inside a privileged admin session, a successful hit can lead to admin-account takeover, malicious plugin installation, and full site compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a publicly accessible Ninja Forms form that uses the Repeatable Fieldset feature - that feature being present and reachable is the concrete precondition, since the vulnerable parseSubmissionIndex()/admin_form_element() path is specific to repeater child-key handling. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue rather than an inflated CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker locates a public Ninja Forms form using a Repeatable Fieldset, submits it with a crafted repeater child key such as '<script>...</script>' as the submission index, and the payload is stored. When a site administrator later opens the submissions view in wp-admin, the script executes in their authenticated session and can steal cookies or silently create a new administrator account. … |
| Remediation | Patch available per vendor advisory: upgrade Ninja Forms to the current fixed release published by Saturday Drive - the exact patched version is not stated in the provided data, so consult the plugin changelog at https://wordpress.org/plugins/ninja-forms/changelog/ and the VulnCheck advisory (https://www.vulncheck.com/advisories/ninja-forms-unauthenticated-stored-cross-site-scripting-via-repeatable-fieldset-submission-index) to confirm the target version, then update from the WordPress plugin screen. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all WordPress installations using Ninja Forms versions 3.10.4-3.14.9 and immediately apply the vendor patch to non-production systems; simultaneously review form submission logs and administrator access logs for evidence of XSS injection attempts. …
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External POC / Exploit Code
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