Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-31954 is a vulnerability in the emlog PHP package version 2.6.6 and earlier, specifically in the asynchronous media file deletion feature. The asynchronous delete action (delete_async) does not perform a check for a CSRF (Cross-Site Request Forgery) token, which means it lacks protection against CSRF attacks.'}, {'type': 'paragraph', 'content': "This flaw allows an attacker to craft a malicious webpage that sends unauthorized POST requests to delete media files without the authenticated user's consent. When an admin user visits this malicious page, the attacker can delete media files asynchronously without proper authorization checks."}] [1]

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Impact Analysis

The vulnerability allows an attacker to delete media files on an emlog website without proper authorization if an authenticated admin visits a malicious webpage. This can lead to unauthorized deletion of media content.

However, the CVSS v3.1 base score is 0.0, indicating that the vulnerability does not impact confidentiality, integrity, or availability directly, and requires low privileges and no user interaction.

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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 `/admin/media.php?action=delete_async` that delete media files without proper CSRF token validation.'}, {'type': 'paragraph', 'content': 'One way to detect exploitation attempts is to look for POST requests to this URL with the parameter `aid` (media ID) being sent without a valid CSRF token.'}, {'type': 'paragraph', 'content': 'Suggested commands to detect such activity include using web server logs or network monitoring tools to filter for these requests.'}, {'type': 'list_item', 'content': 'Using grep on web server access logs to find suspicious POST requests: `grep "POST /admin/media.php?action=delete_async" /var/log/apache2/access.log`'}, {'type': 'list_item', 'content': "Using tcpdump or similar to capture HTTP POST requests to the vulnerable endpoint: `tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep 'POST /admin/media.php?action=delete_async'`"}] [1]

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Mitigation Strategies

The immediate mitigation step is to ensure that the asynchronous delete action (`delete_async`) in `emlog/admin/media.php` includes CSRF token validation by calling `LoginAuth::checkToken()`.

Since no patched versions are available at the time of the advisory, you should manually apply the recommended fix by modifying the code as follows:

• Add `LoginAuth::checkToken();` at the beginning of the `delete_async` action handler to enforce CSRF protection.

Additionally, restrict access to the `/admin/media.php` endpoint to trusted users and consider monitoring for suspicious POST requests as a temporary measure.

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