CVE-2026-6832: Nesquena Hermes WebUI Arbitrary File Deletion via Unvalidated session_id

Vulnerability summary

CVE-2026-6832 is a high (CVSS 8.1) Path Traversal vulnerability in get-hermes hermes_web_ui. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 51.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 21-04-2026
   PublishedVulnerability first disclosed.
2. 14-07-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')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.