CVE-2026-49957

Description

Hermes WebUI before version 0.51.269 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.

References

• 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/v0.51.269
• https://www.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-py