What’s Vulnerable › Vulnerabilities
CVE-2026-83625: Contact Form by Supsystic <= 1.10.2 - Unauthenticated Stored Cross-Site Scripting via IP Address Header
- Severity: high (CVSS 7.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-05 · updated 2026-09-08
- Weakness: CWE-79
Description
The Contact Form by Supsystic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via IP Address Header in all versions up to, and including, 1.10.2 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. An unauthenticated attacker can first call the 'updateNonce' action — which is accessible without authentication due to its absence from the plugin's permission list — to obtain a valid nonce, then submit a contact form with a malicious payload in a spoofed IP header such as X-Forwarded-For.
Affected products
- supsystic Contact Form by Supsystic: through 1.10.2
References
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/classes/utils.php#L77
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/controller.php#L390
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/controller.php#L411
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/js/admin.forms.contacts.list.js#L204
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/models/forms.php#L103
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/classes/utils.php#L77
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/controller.php#L390
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/controller.php#L411
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/js/admin.forms.contacts.list.js#L204
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/models/forms.php#L103
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3679442%40contact-form-by-supsystic&new=3679442%40contact-form-by-supsystic
- https://www.wordfence.com/threat-intel/vulnerabilities/id/aa65bced-a449-4ba5-accf-40a824ee464d?source=cve
Get alerted when CVE-2026-83625 or the next vulnerability affects your stack