CVE-2026-49957

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.

CVSS v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/nesquena/hermes-webui/commit/91a89fb5d5c0bf87932917f9914ad0150ea62fe4
https://github.com/nesquena/hermes-webui/pull/3731
https://github.com/nesquena/hermes-webui/pull/3744
https://github.com/nesquena/hermes-webui/releases/tag/v0.51.296
https://www.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-py

Configurations

No configuration.

History

No history.

Information

Published : 2026-06-09 17:17

Updated : 2026-07-23 08:10

NVD link : CVE-2026-49957

Mitre link : CVE-2026-49957

CVE.ORG link : CVE-2026-49957

JSON object : View

Products Affected

No product.

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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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."}, {"lang": "es", "value": "Hermes WebUI antes de la versi\u00f3n 0.51.269 contiene una vulnerabilidad de omisi\u00f3n de l\u00edmite de espacio de trabajo que permite a atacantes autenticados eludir las comprobaciones de ruta de ra\u00edz bloqueada al explotar un retorno anticipado en la l\u00f3gica de resoluci\u00f3n de espacio de trabajo del perfil de terminal SSH/remoto dentro de _remote_terminal_workspace_candidate(). Los atacantes pueden configurar un directorio de trabajo de terminal remoto a un directorio del sistema como /etc, haciendo que la ruta de resoluci\u00f3n del espacio de trabajo lo acepte como una ra\u00edz de espacio de trabajo local de confianza antes de que se ejecute la protecci\u00f3n _is_blocked_workspace_path(), permitiendo el acceso de lectura a archivos del sistema local a trav\u00e9s de ayudantes de lectura de archivos del espacio de trabajo."}], "lastModified": "2026-07-23T08:10:00.137", "sourceIdentifier": "disclosure@vulncheck.com"}