CVE-2026-15256

Ninja Forms < 3.14.10 - Unauthenticated Arbitrary Shortcode Execution via Query-String Populated Field Default

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 arbitrary shortcodes registered on the site when a form so configured is embedded on a public page.

Affected

Ninja Forms

CVSS v3.1 WPSCAN

4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.24% chance of exploitation in the next 30 days, 15th percentile

Published

2026-08-06

Updated

2026-08-07

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/9c96f977-c105-4b45-a3cd-4751fb4aa5a1/

References

• CVE Record
• NVD entry