Quick answers
- Is CVE-2026-83625 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83625 being exploited in the wild.
- How severe is CVE-2026-83625?
- High severity, with a CVSS score of 7.2, published 5 September 2026.
- Which products and versions are affected?
- Supsystic Contact Form by Supsystic up to and including 1.10.2.
- Is there a fix for CVE-2026-83625?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-83625 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-83625?
- Check whether you run Supsystic Contact Form by Supsystic at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The plugin is vulnerable to stored cross-site scripting (XSS) due to insufficient input sanitization and output escaping of HTTP header data, specifically the X-Forwarded-For header used to capture visitor IP addresses. The vulnerability is exploitable without authentication because the 'updateNonce' action lacks proper permission checks, allowing attackers to obtain a valid nonce and submit a malicious contact form. An unauthenticated attacker can inject arbitrary JavaScript code via a spoofed IP header that will execute whenever the form or its stored data is accessed. The payload persists in the plugin's database, affecting all users who subsequently view the compromised page. Patches addressing input sanitization and output escaping should be applied immediately.
Affected products
- Supsystic Contact Form by Supsystic up to and including 1.10.2
Timeline
- 2026-09-05: disclosed