Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-27202 is a high-severity arbitrary file read vulnerability in GetSimple CMS CE version 3.3.22, specifically in the file upload.php feature.'}, {'type': 'paragraph', 'content': 'The vulnerability occurs because the application improperly handles external input used to build file pathnames within a restricted directory. It fails to neutralize directory traversal sequences like "..", which allows attackers to access files outside the intended upload directory.'}, {'type': 'paragraph', 'content': 'An attacker can exploit this flaw to retrieve sensitive system files by crafting URLs that access files outside the upload folder, leading to exposure of confidential data and a systemic security breach.'}, {'type': 'paragraph', 'content': 'This weakness corresponds to CWE-23 (Relative Path Traversal) and, as of the time of reporting, no patched versions are available.'}] [1]

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Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive system files and confidential data by allowing attackers to read arbitrary files outside the intended upload directory.

Such exposure can cause a systemic security breach, potentially compromising the integrity and confidentiality of the affected 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 attempting to access files outside the intended upload directory using directory traversal sequences such as ".." in the file path. For example, by sending HTTP requests to URLs similar to the vulnerable endpoint and checking if files outside the upload directory can be read.'}, {'type': 'list_item', 'content': 'Use curl or wget to send requests to the upload directory with traversal sequences, e.g.:'}, {'type': 'list_item', 'content': 'curl http://<target-ip>/GetSimpleCMS-CE-3.3.22/data/uploads/../config.php'}, {'type': 'list_item', 'content': 'curl http://<target-ip>/GetSimpleCMS-CE-3.3.22/data/uploads/1.txt'}, {'type': 'paragraph', 'content': 'If the response contains contents of files outside the upload directory, the system is vulnerable.'}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'No patched versions are available at the time of reporting, so immediate mitigation steps include:'}, {'type': 'list_item', 'content': 'Restrict access to the upload.php feature by limiting network exposure or using firewall rules.'}, {'type': 'list_item', 'content': 'Implement web server rules to block requests containing directory traversal sequences such as "..".'}, {'type': 'list_item', 'content': 'Monitor and audit access logs for suspicious requests targeting the upload directory.'}, {'type': 'list_item', 'content': 'Consider disabling or restricting file upload functionality until a fix is available.'}] [1]

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