CVE-2026-49957
Hermes WebUI < 0.51.296 Workspace Boundary Bypass via api/workspace.py
- State
- Published
- Severity
- 6.3 Medium
- Published
- Jun 9, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 2, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | 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 | VulnCheck |
| 3.1 | 7.7 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Products
| Product | Versions |
|---|---|
hermes-webuinesquena |
|
References
- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.296release-notes
- https://github.com/nesquena/hermes-webui/pull/3731issue-tracking
- https://github.com/nesquena/hermes-webui/pull/3744issue-tracking
- https://github.com/nesquena/hermes-webui/commit/91a89fb5d5c0bf87932917f9914ad0150ea62fe4patch
- https://www.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-pythird-party-advisory
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