Emlog up to 2.6.1 REST API Endpoint index.php?rest-api=upload unrestricted upload

Summaryinfo

A vulnerability classified as critical has been found in Emlog up to 2.6.1. This affects an unknown part of the file /index.php?rest-api=upload of the component REST API Endpoint. This manipulation causes unrestricted upload. This vulnerability is tracked as CVE-2026-22799. The attack is possible to be carried out remotely. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical was found in Emlog up to 2.6.1. Affected by this vulnerability is some unknown processing of the file /index.php?rest-api=upload of the component REST API Endpoint. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Emlog is an open source website building system. emlog v2.6.1 and earlier exposes a REST API endpoint (/index.php?rest-api=upload) for media file uploads. The endpoint fails to implement proper validation of file types, extensions, and content, allowing authenticated attackers (with a valid API key or admin session cookie) to upload arbitrary files (including malicious PHP scripts) to the server. An attacker can obtain the API key either by gaining administrator access to enable the REST API setting, or via information disclosure vulnerabilities in the application. Once uploaded, the malicious PHP file can be executed to gain remote code execution (RCE) on the target server, leading to full server compromise.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-22799 since 01/09/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

Applying the patch 429b02fda842254b9b9b39303e9161999c180560 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-1995). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Emlog

Version

• 2.6.0
• 2.6.1

License

• open-source

Website

• Product: https://github.com/emlog/emlog/

CPE 2.3info

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• 🔒

CPE 2.2info

• 🔒
• 🔒

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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