CVE-2025-64264Network attack vector

Stored XSS via unescaped customizer fields

Published Nov 13, 2025 · Updated Nov 13, 2025

Stored XSS in Popup addon for Ninja Forms 3.5.1 and earlier allows remote authenticated users to inject scripts through customizer fields. The plugin stores customizer CSS and JavaScript values, then renders them without context-specific attribute and string escaping. Administrator access, a victim visit, and either WordPress multisite or disabled unfiltered_html are required; scripts run in the visitor's browser context.

CVSS severity5.9
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Popup addon for Ninja Forms 3.5.1 and earlier allows remote authenticated users to inject scripts through customizer fields. The plugin stores customizer CSS and JavaScript values, then renders them without context-specific attribute and string escaping. Administrator access, a victim visit, and either WordPress multisite or disabled unfiltered_html are required; scripts run in the visitor's browser context.

The record

CVE
CVE-2025-64264
Published
Nov 13, 2025
Updated
Nov 13, 2025
Vendor
WebHolics
Product
Popup addon for Ninja Forms
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=<= 3.5.1 changes=[{"at":"3.5.2","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WebHolics · Popup addon for Ninja Formsversion=n/a <=<= 3.5.1 changes=[{"at":"3.5.2","status":"unaffected"}]

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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