What is CVE-2025-5398?

CVE-2025-5398 is a medium-severity vulnerability in Kstover Ninja Forms – The Contact Form Builder That Grows With You, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2025-06-27.

How severe is CVE-2025-5398?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Kstover Ninja Forms – The Contact Form Builder That Grows With You

CVE-2025-5398

The Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the use of a templating engine in all versions up to, and including, 3.10.2.1 due to insufficient output escaping on user data passed through the template. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (11.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Kstover Ninja Forms – The Contact Form Builder That Grows With You — versions 0
Ninjaforms Ninja_forms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@wordfence.com (Third Party Advisory)
security@wordfence.com (Product)
security@wordfence.com (Patch)

Frequently asked questions

What is CVE-2025-5398?: CVE-2025-5398 is a medium-severity vulnerability in Kstover Ninja Forms – The Contact Form Builder That Grows With You, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2025-06-27.
How severe is CVE-2025-5398?: Medium severity. CVSS v3 base score is 6.4 out of 10.