EUVD-2026-84281
GHSA-9248-28p4-jpfp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Anonymous form submission gives PR:N, but an admin must open the submission URL for the stored script to run, so UI:R; execution in the wp-admin origin from a form-stored payload is S:C with C:L/I:L.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
3DescriptionCVE.org
Ninja Forms 3.15.3 stores an anonymous non-RTE textarea value and renders it without safe HTML encoding in the legacy submission editor. An attacker can break out of the textarea with stored script. When an Administrator opens the attacker-known direct submission URL, the script runs in the WordPress admin origin.
Articles & Coverage 1
AnalysisAI
Stored cross-site scripting in the WordPress plugin Ninja Forms (Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder) versions up to and including 3.15.3 allows an unauthenticated visitor to submit a plain, non-rich-text textarea field value that is persisted and later rendered without HTML encoding in the plugin's legacy submission editor, so a crafted payload breaks out of the textarea element and executes as script. The script runs in the WordPress admin origin, but only when a logged-in Administrator opens the specific, attacker-known direct submission URL - meaning the attack requires victim interaction and does not fire automatically. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the legacy submission editor code path where an anonymous, non-RTE textarea field value is rendered without safe HTML encoding in the WordPress admin (admin-metabox-sub-fields.html.php). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N = 7.2) rates this a High, but it overstates real-world triggerability: the description explicitly requires that 'an Administrator opens the attacker-known direct submission URL' before the stored script runs, which is user interaction - so UI:N conflicts with the described exploitation and should be UI:R. … 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 3.15.4 or later, which is the vendor-released patch that fixes the unencoded rendering in the legacy submission editor template and is available through the WordPress plugin updater or the Trac changeset referenced in the advisory; verify the installed version after updating because the plugin also ships under the longer 'Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder' slug. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all WordPress sites using the Ninja Forms plugin and identify any instances of versions up to and including 3.15.3; if the plugin is not business-critical, consider temporarily disabling it. …
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External POC / Exploit Code
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