CVE-2026-83625
Contact Form by Supsystic <= 1.10.2 - Unauthenticated Stored Cross-Site Scripting via IP Address Header
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.
INFO
Published Date :
Sept. 5, 2026, 8:16 a.m.
Last Modified :
Sept. 5, 2026, 8:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the Contact Form by Supsystic plugin.
- Sanitize all user-supplied input.
- Escape output properly before rendering.
- Implement proper access control for actions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-83625.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-83625 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-83625
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-83625 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-83625 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Sep. 05, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/83xxx/CVE-2026-83625.json">CVE-2026-83625</a> Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/classes/utils.php#L77 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/controller.php#L390 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/controller.php#L411 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/js/admin.forms.contacts.list.js#L204 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/models/forms.php#L103 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/classes/utils.php#L77 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/controller.php#L390 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/controller.php#L411 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/js/admin.forms.contacts.list.js#L204 Added Reference https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/models/forms.php#L103 Added Reference https://plugins.trac.wordpress.org/changeset?reponame=&old=3679442%40contact-form-by-supsystic&new=3679442%40contact-form-by-supsystic Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/aa65bced-a449-4ba5-accf-40a824ee464d?source=cve