CVE-2026-83625
Received Received - Intake

Stored XSS in Contact Form by Supsystic WordPress Plugin

Publication date: 2026-09-05

Last updated on: 2026-09-05

Assigner: Wordfence

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.

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Meta Information

Published
2026-09-05
Last Modified
2026-09-05
Generated
2026-09-05
AI Q&A
2026-09-05
EPSS Evaluated
N/A
NVD
CVE-2026-83625
EUVD
EUVD-2026-71934

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
supsystic contact_form to 1.10.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Contact Form by Supsystic WordPress plugin. It allows unauthenticated attackers to inject malicious scripts via a spoofed IP header like X-Forwarded-For. The flaw exists due to insufficient input sanitization and output escaping in versions up to 1.10.2.

Detection Guidance

Check for the Contact Form by Supsystic plugin versions up to and including 1.10.2. Look for suspicious IP headers like X-Forwarded-For in form submissions. Review server logs for unauthorized nonce requests via the 'updateNonce' action.

Impact Analysis

An attacker could execute arbitrary web scripts on pages viewed by users, potentially stealing cookies, session tokens, or other sensitive data. This could lead to account takeovers or defacement of affected websites.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Update the Contact Form by Supsystic plugin to the latest version beyond 1.10.2. Disable the 'updateNonce' action if not needed. Implement input sanitization for IP headers and restrict unauthenticated access to sensitive actions.

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