CVE-2026-49957

HIGH 7.7

Hermes WebUI < 0.51.269 Workspace Boundary Bypass via api/workspace.py

CVSS Score

7.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	nesquena
Product	hermes-webui
Published	Jun 9, 2026
Last Updated	Jun 9, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

nesquena / hermes-webui

0 < 0.51.296

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/nesquena/hermes-webui/releases/tag/v0.51.269 github.com: https://github.com/nesquena/hermes-webui/pull/3731 github.com: https://github.com/nesquena/hermes-webui/pull/3744 github.com: https://github.com/nesquena/hermes-webui/commit/91a89fb5d5c0bf87932917f9914ad0150ea62fe4 vulncheck.com: https://www.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-py

Credits

Chia Min Jun Lennon