---
id: CVE-2026-53977
title: >-
  OpenChamber 1.11.7 contains an authentication bypass vulnerability that allows
  unauthenticated remote attackers to terminate the server process by sending a
  POST request to the /api/system/shutdown endpoint, which is registered before
  th…
summary: >-
  OpenChamber 1.11.7 contains an authentication bypass vulnerability that allows
  unauthenticated remote attackers to terminate the server process by sending a
  POST request to the /api/system/shutdown endpoint, which is registered before
  th…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-306
published: '2026-08-06'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:18:30.540'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53977'
references:
  - url: 'https://github.com/openchamber/openchamber'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/openchamber/openchamber/commit/f1b9506132faf6c564a2694c7f33b94421a49b4a
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/openchamber-unauthenticated-dos-via-api-system-shutdown
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00967
epssPercentile: 0.60163
ingestedAt: '2026-09-16T21:05:36.835Z'
---

## Overview

OpenChamber 1.11.7 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to terminate the server process by sending a POST request to the /api/system/shutdown endpoint, which is registered before the authentication middleware in the Express route handler chain. Attackers can exploit the route registration order in bootstrap-runtime.js to reach the shutdown handler before auth middleware executes, causing denial of service to all active AI coding sessions and locking out legitimate remote users regardless of whether UI_PASSWORD is configured.

## Remediation

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