---
id: CVE-2026-59804
title: >-
  Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a
  missing authentication and CORS misconfiguration vulnerability that allows
  unauthenticated remote attackers to hijack active bridge sessions by opening a
  cross-or…
summary: >-
  Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a
  missing authentication and CORS misconfiguration vulnerability that allows
  unauthenticated remote attackers to hijack active bridge sessions by opening a
  cross-or…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-306
  - CWE-1385
vendor: web-infra-dev
product: midscene
affected:
  - midscene <= 1.10.3
published: '2026-07-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:24.120'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59804'
references:
  - url: >-
      https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882
    label: disclosure@vulncheck.com
  - url: 'https://github.com/web-infra-dev/midscene/issues/2752'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/web-infra-dev/midscene/pull/2759'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-09T14:02:32.806757Z'
epss: 0.00308
epssPercentile: 0.21605
ingestedAt: '2026-10-08T16:52:14.695Z'
---

## Overview

Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connection to the local Socket.IO server, which performs no Origin header validation and requires no authentication token. Attackers can connect from any web page visited by the victim to seize the single-client slot, intercept and inject automation commands, exfiltrate command-payload data, or unconditionally terminate the server by supplying the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter.

## Remediation

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