What is CVE-2026-15256?

CVE-2026-15256 is a medium-severity vulnerability in Ninja Forms, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.8/10. Published 2026-08-06.

How severe is CVE-2026-15256?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Ninja Forms

CVE-2026-15256

The Ninja Forms WordPress plugin before 3.14.10 does not prevent user-supplied query-string input, used to pre-populate a form field's default value, from being processed as a shortcode, allowing unauthenticated attackers to execute arbitr…

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Unknown Ninja Forms — versions 0

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-15256?: CVE-2026-15256 is a medium-severity vulnerability in Ninja Forms, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.8/10. Published 2026-08-06.
How severe is CVE-2026-15256?: Medium severity. CVSS v3 base score is 4.8 out of 10.