CVE-2025-2561Public exploitNetwork attack vector

Stored XSS via unsanitized Custom HTML field

Published May 19, 2025 · Updated Jan 9, 2026

Stored XSS in Ninja Forms before 3.10.1 allows remote authenticated users to execute JavaScript through a crafted Custom HTML field. The form builder stores Custom HTML markup without sufficient sanitization or output escaping, then renders it in embedded forms and the administrative editor. Administrator access is required, and execution occurs when a visitor opens the embedded form or another administrator opens its HTML block.

CVSS severity4.8
Medium
EPSS probability0.25%
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 Ninja Forms before 3.10.1 allows remote authenticated users to execute JavaScript through a crafted Custom HTML field. The form builder stores Custom HTML markup without sufficient sanitization or output escaping, then renders it in embedded forms and the administrative editor. Administrator access is required, and execution occurs when a visitor opens the embedded form or another administrator opens its HTML block.

The record

CVE
CVE-2025-2561
Published
May 19, 2025
Updated
Jan 9, 2026
Vendor
Saturday Drive
Product
Ninja Forms
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 2026Record 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=0 <3.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Saturday Drive · Ninja Formsversion=0 <3.10.1

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

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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