code-projects Exam Form Submission update_s1.php 跨站脚本漏洞

Successful exploitation of CVE-2026-4557 allows an attacker to execute arbitrary JavaScript code in the context of a user's browser. This can lead to session hijacking, defacement of the application, or the theft of sensitive information, such as login credentials or personal data. Given the location of the vulnerable file (/admin/update_s1.php), an attacker who gains access to the administrative interface could potentially compromise the entire application and its underlying data. The public availability of an exploit significantly increases the risk of widespread exploitation.

Administrators and users of Exam Form Submission version 1.0 are at risk. Shared hosting environments where multiple applications share the same server are particularly vulnerable, as a compromise of one application could potentially lead to the compromise of others. Users who rely on the application for sensitive data management are also at heightened risk.

• php / web:

grep -r "sname = [^\"].*?" /var/www/exam_form_submission/

• generic web:

curl -I http://your-exam-form-submission-site.com/admin/update_s1.php?sname=<script>alert(1)</script>

1. 2026-03-22Disclosure

   disclosure

1. 已保留2026-03-21
2. 发布日期2026-03-22
3. 修改日期2026-03-23
4. EPSS 更新日期2026-03-30

The primary mitigation for CVE-2026-4557 is to upgrade to the patched version of Exam Form Submission. If an immediate upgrade is not feasible, implement a Web Application Firewall (WAF) rule to filter out malicious input containing script tags or other XSS payloads targeting the 'sname' parameter in /admin/update_s1.php. Input validation and sanitization on the server-side are also crucial to prevent the injection of malicious code. Consider implementing Content Security Policy (CSP) to restrict the sources from which scripts can be executed.