Flextype up to 1.0.0-alpha.3 Entries REST API id/new_id path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in Flextype up to 1.0.0-alpha.3. Affected by this issue is some unknown functionality of the component Entries REST API. Such manipulation of the argument id/new_id leads to path traversal. This vulnerability is uniquely identified as CVE-2026-91751. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Flextype up to 1.0.0-alpha.3 and classified as critical. Affected by this issue is some unknown functionality of the component Entries REST API. The manipulation of the argument id/new_id with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Flextype CMS through 1.0.0-alpha.3 fails to properly validate id and new_id parameters in the Entries REST API, allowing API token holders to read, create, or overwrite files outside the entries directory. Attackers can use traversal sequences in API requests to escape the project entries directory and manipulate arbitrary files and directories on the filesystem.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-91751 since 09/15/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/15/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-78233). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Flextype

Version

• 1.0.0-alpha.0
• 1.0.0-alpha.1
• 1.0.0-alpha.2
• 1.0.0-alpha.3

Website

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

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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