Contact Form by Supsystic <= 1.10.2 - Unauthenticated Stored Cross-Site Scripting via IP Address Header

Summary

CVE	CVE-2026-83625
State	PUBLISHED
Assigner	Wordfence
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-09-05 08:16:40 UTC
Updated	2026-09-05 08:16:40 UTC
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.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.2	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`
3.1	CNA	DECLARED	7.2	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Supsysticcom	Contact Form By Supsystic	affected 1.10.2 semver	Not specified

References

Reference	Source	Link	Tags
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/js...	[email protected]	plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/aa65bced-a449-4ba5-accf-40a82...	[email protected]	www.wordfence.com
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/co...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/mo...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/classes/utils.php	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/c...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/m...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/c...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/modules/forms/co...	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.8.1/classes/utils.php	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset	[email protected]	plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.10.2/modules/forms/j...	[email protected]	plugins.trac.wordpress.org
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: andrea bocchetti (en)

Additional Advisory Data

Source	Time	Event
CNA	2026-08-31T21:04:59.000Z	Vendor Notified
CNA	2026-09-04T19:31:56.000Z	Disclosed

There are currently no legacy QID mappings associated with this CVE.