Path Traversal in Nesquena Hermes-Webui
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.004 (35.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Nesquena Hermes-webui — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (issue-tracking, technical-description)
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com
- disclosure@vulncheck.com (third-party-advisory)
- disclosure@vulncheck.com (release-notes)
Frequently asked questions
- What is CVE-2026-49957?
- CVE-2026-49957 is a high-severity vulnerability in Nesquena Hermes-Webui, classified under Path Traversal. CVSS score: 7.7/10. Published 2026-06-09.
- How severe is CVE-2026-49957?
- High severity. CVSS v3 base score is 7.7 out of 10.