Forminator Forms <= 1.57.0 - Unauthenticated DOM-Based Cross-Site Scripting via 'error_description' Parameter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-18328
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-25 08:18:08 UTC
Updated2026-08-26 16:19:05 UTC
DescriptionThe Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to DOM-Based Reflected Cross-Site Scripting via the 'error_description' parameter in all versions up to, and including, 1.57.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability is only triggerable on pages hosting a Forminator form configured to use the Stripe Checkout Sessions payment API, which became the default in 1.56.0.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.002410000 probability, percentile 0.150340000 (date 2026-08-26)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wpmudev Forminator Forms Contact Form Payment Form Custom Form Builder affected 1.57.0 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/a669f05d-67c7-45ac-ae56-e7c63... [email protected] www.wordfence.com
plugins.trac.wordpress.org/changeset/3652645/forminator/trunk/assets/js/front/front.stri... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Adrien Brunner (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-29T19:53:33.000ZVendor Notified
CNA2026-08-24T18:48:11.000ZDisclosed

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