nesquena hermes-webui up to 408 JSON File /api/session/delete session_id path traversal

Summaryinfo

A vulnerability categorized as critical has been discovered in nesquena hermes-webui up to 408. Affected by this issue is some unknown functionality of the file /api/session/delete of the component JSON File Handler. Executing a manipulation of the argument session_id can lead to path traversal. The identification of this vulnerability is CVE-2026-6832. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in nesquena hermes-webui up to 408 and classified as critical. This vulnerability affects an unknown functionality of the file /api/session/delete of the component JSON File Handler. The manipulation of the argument session_id with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity, and availability. CVE summarizes:

Hermes WebUI contains an arbitrary file deletion vulnerability in the /api/session/delete endpoint that allows authenticated attackers to delete files outside the session directory by supplying an absolute path or path traversal payload in the session_id parameter. Attackers can exploit unvalidated session identifiers to construct paths that bypass the SESSION_DIR boundary and delete writable JSON files on the host system.

The weakness was shared by Chia Min Jun Lennon. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-6832 since 04/21/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 409 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 3cc5839bf303fa6758bfdac538507407a2929655 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• nesquena

Name

• hermes-webui

Version

• 408

License

• open-source

Website

• Product: https://github.com/nesquena/hermes-webui/

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