CVE-2025-6396: Webbeyaz Website Software XSS Vulnerability

CVE-2025-6396 Overview

CVE-2025-6396 is a Cross-Site Scripting (XSS) vulnerability affecting Webbeyaz Website Design Website Software through version 2025.07.14. The flaw stems from improper neutralization of input during web page generation, classified under [CWE-79]. Attackers can inject malicious scripts that execute in the browser context of victims who interact with crafted content.

The issue was reported through Turkey's national cyber incident response channels (USOM). The vulnerability requires user interaction to trigger, and successful exploitation can compromise session data, redirect users, or deliver secondary payloads.

Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser session, enabling credential theft, session hijacking, and content manipulation across the affected web application.

Affected Products

Webbeyaz Website Design Website Software through 2025.07.14
All deployments running the vulnerable release without a vendor-supplied fix
Public-facing instances that render user-supplied input without sanitization

Discovery Timeline

2025-09-26 - CVE-2025-6396 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-6396

Vulnerability Analysis

The vulnerability is a reflected or stored Cross-Site Scripting issue in the Webbeyaz Website Software. Input supplied through user-controllable parameters is written into HTML output without proper encoding or sanitization. When a browser renders the response, the injected payload executes within the security context of the site's origin.

Exploitation requires the victim to visit a crafted URL or view attacker-controlled content within the application. Because the scope changes upon successful exploitation, the payload can affect resources beyond the vulnerable component, such as parent frames or authenticated sessions. The confidentiality and integrity impact are limited but sufficient to steal session cookies, capture keystrokes, or perform actions on behalf of the user.

Root Cause

The root cause is missing output encoding on data flows that end in HTML, attribute, or JavaScript sinks. The application accepts input from web parameters and echoes it into responses without applying context-aware escaping. This maps directly to [CWE-79], Improper Neutralization of Input During Web Page Generation.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a URL or form submission containing JavaScript payloads and lures an authenticated or anonymous user to trigger it. Delivery mechanisms typically include phishing emails, malicious links posted on forums, or attacker-controlled sites that submit requests to the vulnerable application.

No verified public proof-of-concept code is available. Refer to the USOM Notification TR-25-0302 for advisory details.

Detection Methods for CVE-2025-6396

Indicators of Compromise

Unexpected <script>, onerror=, onload=, or javascript: sequences in HTTP request parameters or referrer headers
Web server access logs containing URL-encoded payloads such as %3Cscript%3E, %3Cimg, or %3Csvg
Outbound requests from user browsers to unfamiliar domains shortly after visiting the affected site
Session cookies observed being transmitted to non-application endpoints

Detection Strategies

Deploy a Web Application Firewall (WAF) with signatures for reflected and stored XSS payloads targeting HTML, attribute, and JavaScript contexts
Enable Content Security Policy (CSP) violation reporting to capture attempted script injections at the browser level
Correlate web server logs with authentication and session anomalies to identify suspected script execution

Monitoring Recommendations

Alert on abnormal spikes in requests containing HTML metacharacters (<, >, ", ') against Webbeyaz endpoints
Monitor for administrative accounts performing unexpected actions that could indicate session takeover
Track referrer patterns to identify phishing campaigns directing users to malicious URLs

How to Mitigate CVE-2025-6396

Immediate Actions Required

Contact Webbeyaz to obtain a fixed release beyond version 2025.07.14 and apply it as soon as available
Deploy a WAF rule set that blocks common XSS payload patterns targeting the affected application
Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources
Rotate any administrative session cookies and credentials if suspicious activity is observed

Patch Information

At the time of publication, no vendor patch identifier is listed in the NVD entry. Consult the Siber Güvenlik Notification TR-25-0302 and the USOM Notification TR-25-0302 for updated vendor guidance and remediation status.

Workarounds

Place the application behind a reverse proxy that sanitizes or blocks requests containing script tags and event-handler attributes
Enable the HttpOnly and Secure flags on session cookies to reduce the impact of successful script execution
Restrict access to authenticated sections of the site using IP allowlists or VPN gating until a patch is deployed
Disable or restrict any user-generated content features that render input back to other users

bash

# Example CSP header to mitigate XSS execution
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'; report-uri /csp-report