masci banks up to 2.4.3 Media Filters open Value path traversal

Summaryinfo

A vulnerability labeled as problematic has been found in masci banks up to 2.4.3. This affects the function Open of the component Media Filters. The manipulation of the argument Value results in path traversal. This vulnerability is known as CVE-2026-62663. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in masci banks up to 2.4.3. Affected is the function open of the component Media Filters. The manipulation of the argument value with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality. CVE summarizes:

Banks generates meaningful LLM prompts using a simple template language. In versions prior to 2.4.4, all four media filters (image, audio, video, document) in banks accept untrusted user input as file paths via Path(value) and pass them directly to open(file_path, "rb") without any path sanitization, canonicalization, or directory restriction. An attacker who controls template variables passed to a banks Prompt can use path traversal (../) to read arbitrary files accessible to the Python process—including .env files, SSH keys, cloud credentials, source code, /etc/passwd, and /etc/shadow—with the content returned base64-encoded in the rendered prompt output, making exfiltration trivial. This is particularly dangerous for applications that use banks to process user-provided template variables before sending prompts to an LLM. This issue has been fixed in version 2.4.4.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-62663 since 07/14/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 2.4.4 eliminates this vulnerability.

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Productinfo

Type

• Banking Software

Vendor

• masci

Name

• banks

Version

• 2.4.0
• 2.4.1
• 2.4.2
• 2.4.3

Website

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

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