---
id: CVE-2026-49957
title: Hermes WebUI < 0.51.296 Workspace Boundary Bypass via api/workspace.py
summary: >-
  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…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-22
vendor: nesquena
product: hermes-webui
affected:
  - hermes-webui < 0.51.296
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-09T20:21:59.197539Z'
published: '2026-06-09'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:04:58.843Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-49957'
references:
  - url: 'https://github.com/nesquena/hermes-webui/releases/tag/v0.51.296'
    label: hermes-webui 0.51.296 Release Notes
  - url: 'https://github.com/nesquena/hermes-webui/pull/3731'
  - url: 'https://github.com/nesquena/hermes-webui/pull/3744'
  - url: >-
      https://github.com/nesquena/hermes-webui/commit/91a89fb5d5c0bf87932917f9914ad0150ea62fe4
  - url: >-
      https://www.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-py
tags:
  - cve.org
epss: 0.00421
epssPercentile: 0.3667
ingestedAt: '2026-11-08T14:51:22.382Z'
---

## Overview

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

- `hermes-webui < 0.51.296`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.