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Description

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.

PUBLISHED Reserved 2026-06-02 | Published 2026-06-09 | Updated 2026-06-10 | Assigner VulnCheck




MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

HIGH: 7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Problem types

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

Product status

Default status
affected

Any version before 0.51.296
affected

Credits

Chia Min Jun Lennon finder

References

github.com/nesquena/hermes-webui/releases/tag/v0.51.296 release-notes

github.com/nesquena/hermes-webui/pull/3731 technical-description

github.com/nesquena/hermes-webui/pull/3744 issue-tracking

github.com/...ommit/91a89fb5d5c0bf87932917f9914ad0150ea62fe4 patch

www.vulncheck.com/...ce-boundary-bypass-via-api-workspace-py third-party-advisory

cve.org (CVE-2026-49957)

nvd.nist.gov (CVE-2026-49957)

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