XSS in Smub Wpforms – Ai Form Builder For WordPress Contact Forms, Payment Survey Form, Quiz & More

CVE-2026-101921

The WPForms – AI Form Builder for WordPress – Contact Forms, Payment Forms, Survey Form, Quiz & More plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'attacker-chosen key referenced by the smart tag (e.g. "x")' parameter in all versions up to, and including, 2.0.2.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires that a site administrator has previously saved a form whose description embeds a {query_var} Smart Tag inside an iframe srcdoc attribute and has enabled Show Description on a public-facing page.

Vulnerability class: XSS (Cross-Site Scripting)

Published .

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.

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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-101921?
CVE-2026-101921 is a medium-severity vulnerability in Smub Wpforms – Ai Form Builder For WordPress Contact Forms, Payment Survey Form, Quiz & More, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-10-10.
How severe is CVE-2026-101921?
Medium severity. CVSS v3 base score is 4.7 out of 10.