Vulnerability · Published Jun 9, 2026 · Assigned by VulnCheck

CVE-2026-49957Hermes WebUI < 0.51.296 Workspace Boundary Bypass via api/workspace.py

High 7.7

In plain English

A high-severity path traversal in hermes-webui from nesquena. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.4%top 63.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
nesquena	hermes-webui	0 – before 0.51.296

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

https://github.com/nesquena/hermes-webui/releases/tag/v0.51.296 release-notes
https://github.com/nesquena/hermes-webui/pull/3731 issue-tracking
https://github.com/nesquena/hermes-webui/pull/3744 issue-tracking
https://github.com/nesquena/hermes-webui/commit/91a89fb5d5c0bf87932917f9914ad0150ea62fe4 patch
https://www.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-py third-party-advisory