What is CVE-2026-110899?

CVE-2026-110899 is a high-severity vulnerability in Kevin Stover Ninja Forms, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-10-21.

How severe is CVE-2026-110899?

High severity. CVSS v3 base score is 7.1 out of 10.

Is CVE-2026-110899 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Kevin Stover Ninja Forms

CVE-2026-110899

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kevin Stover Ninja Forms ninja-forms allows Stored XSS.This issue affects Ninja Forms: from n/a through 3.15.5.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-21 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Kevin Stover Ninja Forms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

synapes620/CVE-2026-110899

References

patchstack.com/database/wordpress/plugin/ninja-forms/vulnerability/wordpress-ni… (vdb-entry)

Frequently asked questions

What is CVE-2026-110899?: CVE-2026-110899 is a high-severity vulnerability in Kevin Stover Ninja Forms, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-10-21.
How severe is CVE-2026-110899?: High severity. CVSS v3 base score is 7.1 out of 10.
Is CVE-2026-110899 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.