Vulnerability · CVE-2026-94504
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published Oct 6, 2026 · corrected/updated Oct 6, 2026 · kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder · evidence confidence very high
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-94504 is a unknown public vulnerability record for kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: no CVSS/EPSS yet. CISA lists it as known exploited. Sources contributing to this record: cve_org, patchstack, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Oct 6, 2026. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 6, 2026 · CISA KEV
Known exploited
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Oct 6, 2026 · Patchstack Database
Detected
CVE-2026-94504 is listed by Four ways back in: the WordPress XSS campaign that hides its own admin account.
Affected
- vendor kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builderversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-94504
Official CVE identifier
cve.org - Patchstack DatabaseVendor advisoryCVE-2026-94504
Two unrelated WordPress plugins, two separate stored Cross-Site Scripting vulnerabilities, one payload. Over the past several days our telemetry has recorded exploitation attempts against both, and every attempt pulls the same JavaScript from imgcdn1.com. Two is what we have conf
patchstack.com - VulnCheck KEVConfirmed exploitationCVE-2026-94504
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
vulncheck.com