code-projects Exam Form Submission update_s4.php cross site scripting

Successful exploitation of CVE-2026-4577 enables an attacker to execute arbitrary JavaScript code within the context of a user's browser session. This can lead to various malicious activities, including session hijacking, credential theft, and defacement of the application's interface. The attacker could potentially gain access to sensitive data stored within the application or redirect users to malicious websites. Given the public availability of an exploit, the risk of exploitation is elevated, particularly for systems that are not promptly patched.

Administrators and users of Exam Form Submission 1.0 are at risk. Systems with weak input validation or lacking a WAF are particularly vulnerable. Shared hosting environments utilizing this software are also at increased risk due to the potential for cross-tenant exploitation.

• php / server:

grep -r 'sname' /var/www/html/admin/update_s4.php

• generic web:

curl -I http://your-exam-form-submission-url/admin/update_s4.php?sname=<script>alert(1)</script>

• generic web:

curl 'http://your-exam-form-submission-url/admin/update_s4.php?sname=<img src=x onerror=alert(1)>' -s -o /dev/null -w '%{http_code}
'

1. 2026-03-23Disclosure

   disclosure

1. Réservé2026-03-22
2. Publiée2026-03-23
3. EPSS mis à jour2026-03-30

The primary mitigation for CVE-2026-4577 is to upgrade to a patched version of Exam Form Submission. Since a fixed version is not specified, thoroughly review the code-projects repository for updates and security advisories. As a temporary workaround, implement strict input validation and output encoding on the 'sname' parameter within the /admin/update_s4.php file. Consider using a Web Application Firewall (WAF) with XSS filtering rules to block malicious requests. After applying mitigation steps, verify the fix by attempting to inject a simple XSS payload (e.g., <script>alert(1)</script>) through the 'sname' parameter and confirming that it is properly sanitized.