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Vulnerability record · CVE-2026-65048 · published 21 July 2026

CVE-2026-65048: Cross-site scripting vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.54% · top 57.0% CWE-79 · Cross-site scripting Deferred
9.3CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
21 Jul 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://wordpress.org/plugins/ninja-forms/
https://wordpress.org/plugins/ninja-forms/changelog/
https://www.vulncheck.com/advisories/ninja-forms-unauthenticated-stored-cross-site-scripting-via-repeatable-fieldset-sub

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Source: NIST National Vulnerability Database (record CVE-2026-65048), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.