CVE-2026-18328 json
Forminator Forms <= 1.57.0 - Unauthenticated DOM-Based Cross-Site Scripting via 'error_description' Parameter
published 2026-08-25 2 mo ago modified 2026-08-26 2 mo ago also EUVD-2026-65316
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
Summary
The 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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
- wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/a669f05d-67c7-45ac-ae56-e7c637ece880?source=cve
- plugins.trac.wordpress.org /browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L196
- plugins.trac.wordpress.org /browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L543
- plugins.trac.wordpress.org /browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L1539
- plugins.trac.wordpress.org /browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L468
- plugins.trac.wordpress.org /changeset/3652645/forminator/trunk/assets/js/front/front.stripe.js
- plugins.trac.wordpress.org /changeset?old_path=%2Fforminator/tags/1.57.0&new_path=%2Fforminator/tags/1.57.0.1
Sources
- CVE List CVE-2026-18328
- NVD CVE-2026-18328
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.