CVE-2026-83625
HighCVSS 7.2Summary
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.
Risk Assessment
The risk includes execution of malicious scripts in the user's browser, potentially leading to session theft, account takeover, or malware distribution.
Recommendation
It is recommended to update the plugin to the latest patched version and implement proper sanitization and output escaping for IP headers.
Other vulnerabilities in Contact Form by Supsystic
See all- CVE-2026-73379Medium
The Contact Form by Supsystic plugin version earlier than 1.10.0 has a bypass vulnerability that does not require authentication. This means an unauthenticated attacker can bypass security mechanisms and gain unauthorized access.
- CVE-2026-73378High
Unauthenticated Cross Site Scripting (XSS) vulnerability in Contact Form by Supsystic versions prior to 1.10.0.
Original NVD description (English source)
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.