CVE-2026-4909
Cross-Site Scripting in Exam Form Submission /admin/update_s7.php
Publication date: 2026-03-27
Last updated on: 2026-04-29
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
| CWE-94 | The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
The CVE-2026-4909 vulnerability is a Cross-Site Scripting (XSS) flaw found in the Exam Form Submission project version 1.0, specifically in the '/admin/update_s7.php' file.
This vulnerability occurs because the application directly outputs user input from the 'sname' parameter to the web page without proper encoding or filtering.
This lack of input validation and output encoding allows attackers to inject malicious JavaScript code, which executes in the victim's browser.
Exploitation does not require user authentication or authorization and can be initiated remotely.
How can this vulnerability impact me? :
Attackers can leverage this vulnerability to perform unauthorized actions such as stealing cookies, session tokens, or other sensitive information.
They can also deface web pages, redirect users to malicious sites, and potentially gain control over the victim's browser.
This poses a significant threat to user privacy and system security.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
The vulnerability can be detected by testing the 'sname' parameter in the '/admin/update_s7.php' file for Cross-Site Scripting (XSS) issues. This involves injecting a test payload such as `<script>prompt(/xss/);</script>` into the 'sname' parameter and observing if the script executes in the browser.
You can use tools like curl or browser-based testing to send requests with the malicious payload and check the response for unencoded script execution.
- Example curl command to test the vulnerability: curl -G --data-urlencode "sname=<script>prompt(/xss/);</script>" https://your-target-site.com/admin/update_s7.php
- Use a web proxy tool like Burp Suite or OWASP ZAP to intercept and modify requests to inject the payload and observe the response.
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include:
- Implement proper output encoding for the 'sname' parameter when rendering it on the web page, using context-appropriate encoding methods (HTML, JavaScript, CSS, URL).
- Enforce strict input validation and filtering on the 'sname' parameter to allow only expected formats and reject or escape potentially malicious content such as script tags.
- Implement a strict Content Security Policy (CSP) to restrict script sources and block unauthorized inline and external scripts.
- Set HttpOnly and Secure flags on sensitive cookies to prevent JavaScript access and ensure transmission only over HTTPS.
- Conduct regular security audits and code reviews to detect and fix XSS and other vulnerabilities promptly.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The CVE-2026-4909 vulnerability is a Cross-Site Scripting (XSS) flaw that allows attackers to execute malicious scripts in users' browsers, potentially leading to unauthorized access to sensitive information such as cookies and session tokens.
Such unauthorized access and potential data breaches can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and disclosure.
Failure to remediate this vulnerability could result in violations of these regulations due to compromised user privacy and data security.