CVE-2026-65048 PUBLISHED

Ninja Forms Unauthenticated Stored Cross-Site Scripting via Repeatable Fieldset Submission Index

Assigner: VulnCheck
Reserved: 21.07.2026 Published: 21.07.2026 Updated: 21.07.2026

Ninja Forms plugin for WordPress versions 3.10.4 through 3.14.9 contains an unauthenticated stored cross-site scripting vulnerability in the Repeatable Fieldset feature where parseSubmissionIndex() accepts arbitrary strings as submission indexes without numeric validation, and admin_form_element() interpolates the index directly into HTML without escaping. An unauthenticated attacker can submit a public form with a crafted repeater child key containing malicious script payloads, which execute in an administrator's browser when viewing submissions in the WordPress admin panel, enabling session-cookie theft, creation of administrator accounts, installation of malicious plugins, and arbitrary modification of site content.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CVSS Score: 9.3

Product Status

Vendor Saturday Drive
Product Ninja Forms
Versions Default: affected
  • affected from 3.10.4 to 3.14.9 (excl.)
  • Version 3.14.9 is unaffected

Credits

  • Pavel Kohout reporter

References

Problem Types

  • Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE