A vulnerability was found in GetSimpleCMS up to 3.3.15. It has been declared as critical. This vulnerability affects an unknown part of the file admin/upload.php of the component phar File Handler. 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 weakness was published 06/23/2021. The advisory is shared for download at github.com. This vulnerability was named CVE-2021-28976. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1608.002.

By approaching the search of inurl:admin/upload.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 3.3.16 eliminates this vulnerability.

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• GetSimpleCMS

Version

• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.3.5
• 3.3.6
• 3.3.7
• 3.3.8
• 3.3.9
• 3.3.10
• 3.3.11
• 3.3.12
• 3.3.13
• 3.3.14
• 3.3.15

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