Executive Summary

CVE-2026-3770 is a Cross-Site Request Forgery (CSRF) vulnerability found in SourceCodester Computer Laboratory Management System version 1.0. The vulnerability exists because the application does not implement any CSRF protection mechanisms on state-changing requests, specifically in the user update functionality handled by the save_users() function in classes/Users.php. This allows an attacker to craft a malicious webpage that, when visited by an authenticated administrator, can send unauthorized POST requests to modify administrator account details without their consent.

The application relies solely on session cookies for authentication but fails to verify the authenticity or origin of POST requests, making it vulnerable to CSRF attacks. Exploitation requires user interaction, such as the administrator visiting a malicious link, and can be carried out remotely.

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Impact Analysis

This vulnerability can lead to unauthorized modifications of administrator accounts, potentially resulting in privilege escalation or administrative account takeover.

An attacker exploiting this flaw can fully compromise the application by changing administrator details without their knowledge or consent.

Because the attack can be performed remotely and requires only that the administrator interacts with a malicious webpage, it poses a significant security risk to the integrity and control of the system.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for unauthorized POST requests to the endpoint handling user updates, specifically `/classes/Users.php?f=save` or `/php-lms/classes/Users.php?f=save`.'}, {'type': 'paragraph', 'content': 'Detection involves checking for POST requests that modify administrator accounts without proper CSRF tokens or origin validation.'}, {'type': 'paragraph', 'content': 'You can use network monitoring tools or web server logs to identify suspicious POST requests to this endpoint.'}, {'type': 'list_item', 'content': 'Use command-line tools like `tcpdump` or `Wireshark` to capture HTTP POST traffic targeting `/classes/Users.php?f=save`.'}, {'type': 'list_item', 'content': "Use `grep` on web server logs to find POST requests to the vulnerable endpoint, for example: `grep 'POST /classes/Users.php?f=save' /var/log/apache2/access.log`."}, {'type': 'list_item', 'content': 'Check for missing or invalid CSRF tokens in POST requests if application logs or debugging tools are available.'}] [1, 2]

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Mitigation Strategies

Immediate mitigation steps include implementing anti-CSRF protections on all state-changing requests.

• Add anti-CSRF tokens to forms and validate them server-side before processing POST requests.
• Validate the origin and referer headers of incoming requests to ensure they come from trusted sources.
• Enforce SameSite cookie attributes to prevent cookies from being sent with cross-site requests.
• Restrict administrative access and monitor for suspicious activity on the vulnerable endpoints.

If immediate code changes are not possible, consider restricting access to the vulnerable endpoint via network controls or temporarily disabling the affected functionality.

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