CVE-2026-49957 MEDIUM

CVE-2026-49957: Hermes WebUI < 0.51.296 Workspace Boundary Bypass via api/workspace.py

Vendor Nesquena
Product hermes-webui
Weakness CWE-22 · Path traversal
Published June 9, 2026
Last update June 10, 2026

CVSS base score

6.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

What the vulnerability does

01Description

Hermes WebUI before version 0.51.296 contains a workspace boundary bypass vulnerability that allows authenticated attackers to circumvent blocked-root path checks by exploiting an early return in the SSH/remote terminal profile workspace resolution logic within _remote_terminal_workspace_candidate(). Attackers can configure a remote terminal working directory to a system directory such as /etc, causing the workspace resolution path to accept it as a trusted local workspace root before the _is_blocked_workspace_path() guard executes, enabling read access to local system files through workspace file-read helpers.

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 10, 2026 Record updated