CVE-2026-83625 Contact Form by Supsystic <= 1.10.2 - Unauthenticated Stored Cross-Site Scripting via IP Address Header
Unauthenticated attackers can inject arbitrary scripts via spoofed IP headers in the Contact Form by Supsystic plugin, leading to stored XSS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83625?
CVE-2026-83625 is a high-severity cross-site scripting vulnerability in supsysticcom Contact Form by Supsystic, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-83625?
How do I fix CVE-2026-83625?
No fix has been published for CVE-2026-83625 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-83625 being exploited?
There is no known exploitation of CVE-2026-83625 in the wild and no public exploit code.
Sources
Also known as GHSA-47p6-99pv-q7v3.