masci Banks up to 2.5.0 DirectoryPromptRegistry index.json path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in masci Banks up to 2.5.0. The affected element is the function DirectoryPromptRegistry._scan/DirectoryPromptRegistry.get/DirectoryPromptRegistry.set/DirectoryPromptRegistry._save/DirectoryPromptRegistry._load of the file index.json of the component DirectoryPromptRegistry. The manipulation leads to path traversal. This vulnerability is traded as CVE-2026-107716. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in masci Banks up to 2.5.0. It has been rated as critical. This issue affects the function DirectoryPromptRegistry._scan/DirectoryPromptRegistry.get/DirectoryPromptRegistry.set/DirectoryPromptRegistry._save/DirectoryPromptRegistry._load of the file index.json of the component DirectoryPromptRegistry. The manipulation 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. The summary by CVE is:

Banks generates meaningful LLM prompts using a simple template language. Prior to 2.5.1, Banks DirectoryPromptRegistry does not reject symbolic links for index.json or discovered and existing .jinja prompt files. In an application where untrusted users can influence a prompt directory, DirectoryPromptRegistry._scan() and DirectoryPromptRegistry.get() can follow a link outside the registry root and disclose a file, while DirectoryPromptRegistry.set(), DirectoryPromptRegistry._save(), and DirectoryPromptRegistry._load() can read or overwrite an external link target. The issue requires attacker influence over the registry directory or its extracted contents. This issue is fixed in version 2.5.1.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-107716 since 10/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

By approaching the search of inurl:index.json it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.5.1 eliminates this vulnerability.

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Productinfo

Type

• Banking Software

Vendor

• masci

Name

• Banks

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5.0

Website

• Product: https://github.com/masci/banks/

CPE 2.3info

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CPE 2.2info

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