Executive Summary

CVE-2026-4968 is a Cross-Site Request Forgery (CSRF) vulnerability found in the Diary App developed by SourceCodester. The vulnerability exists in the diary entry deletion functionality within the file diary.php. Specifically, the deletion operation is triggered via a GET request parameter named 'delete' without any CSRF protection mechanisms such as tokens or origin checks.

Because the deletion is performed through a GET request without verifying the legitimacy of the request, an attacker can craft a malicious webpage that, when visited by an authenticated user, automatically sends a deletion request. This causes unauthorized deletion of diary entries without the user's consent.

The attack requires the victim to be logged into the Diary App and to visit the attacker-controlled webpage while their session is active.

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Compliance Impact

The vulnerability allows unauthorized deletion of user-generated diary entries due to a Cross-Site Request Forgery (CSRF) flaw in the Diary App. This results in loss of personal data integrity, as user content can be silently manipulated without consent.

Such unauthorized data manipulation and loss of personal data could negatively impact compliance with data protection regulations like GDPR and HIPAA, which require ensuring the integrity and protection of personal data.

Although there is no confidentiality breach or data exposure, the integrity compromise and potential loss of personal data may violate principles of data accuracy, user consent, and data protection mandated by these standards.

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Impact Analysis

This vulnerability can lead to unauthorized deletion of your diary entries in the Diary App without your knowledge or consent.

The impact is primarily on data integrity, as your personal diary content can be silently and maliciously removed.

There is no exposure of confidential data or impact on the availability of the application, but the loss of your diary entries can be significant depending on your usage.

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Detection Guidance

This vulnerability can be detected by monitoring for unauthorized GET requests to the vulnerable endpoint that trigger deletion actions without proper CSRF protections.

Specifically, look for HTTP GET requests to the URL path containing `/diary_app/diary-app/diary.php?delete=` with a diary entry ID parameter.

You can use network monitoring tools or web server logs to identify such requests.

• Use command-line tools like `grep` on web server access logs to find suspicious GET requests, e.g.: `grep "GET /diary_app/diary-app/diary.php?delete=" /var/log/apache2/access.log`
• Use `tcpdump` or `Wireshark` to capture HTTP traffic and filter for GET requests to the vulnerable endpoint.
• Check for unexpected or automated requests that delete diary entries without user interaction.

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Mitigation Strategies

Immediate mitigation steps include implementing CSRF protections and changing the deletion operation to use POST requests instead of GET.

• Modify the application to require a CSRF token for all state-changing requests, validating the token server-side.
• Change the deletion functionality to use POST requests rather than GET requests.
• Validate the origin of requests to ensure they come from trusted sources.
• Use the `SameSite` attribute on cookies to restrict cross-site requests.
• Add confirmation dialogs for destructive actions like deletion to prevent accidental or automated deletions.

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