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CVE-2026-53976 – Unauthenticated Arbitrary File Read (Path Traversal) – OpenChamber ≤ 1.11.7

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Summary

CVE-2026-53976 is a path traversal vulnerability in OpenChamber that allows unauthenticated, remote attackers to read arbitrary files on the host. The flaw affects OpenChamber versions 0 through 1.11.7 and is rated Critical (CVSS v4.0 9.3 / CVSS v3.1 9.1). Exposed secrets such as JWT signing keys, SSH private keys, and credentials can be leveraged to achieve authentication bypass.

Technical details

  • Root cause (CWE-22): The workspace boundary check is bypassed when a request sets allowOutsideWorkspace=true, causing the server to treat a user-supplied absolute path as valid and skip containment enforcement.
  • Trigger conditions: No authentication is required on default deployments. A single crafted request to a file-access endpoint (/api/fs/read, /api/fs/stat, or /api/fs/raw) with allowOutsideWorkspace=true and an absolute path is sufficient. Example: GET /api/fs/read?allowOutsideWorkspace=true&path=/etc/passwd.
  • Attack vector: Network; low complexity; no privileges or user interaction.
  • Impact: Disclosure of arbitrary files readable by the server process (JWT secrets, SSH keys, environment variables, credentials), which can enable forged sessions and full authentication bypass on password-protected instances.

Affected software

  • OpenChamber versions 0 through 1.11.7 (all releases up to and including 1.11.7).

Severity

  • CVSS v3.1: 9.1 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  • CVSS v4.0: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade to a fixed release (1.13.0) that contains the security fix from commit f1b9506. In the patched version, access to files outside the workspace requires a server-minted outsideFileGrant token, and requests lacking it are rejected with HTTP 400.
  • If no patch can be applied: Restrict network exposure of the OpenChamber file-access endpoints (/api/fs/read, /api/fs/stat, /api/fs/raw) — do not expose the service to untrusted networks, place it behind authentication and an allowlist/reverse proxy, and bind it to loopback where remote access is not required.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: OpenChamber - AI Coding Assistant
  • Raw response body: openchamber.pwaName, openchamber.pwaOrientation, openchamber.mobileKeyboardMode, openchamber.pwaRecentSessions, __OPENCHAMBER_GET_PWA_, __OPENCHAMBER_SET_PWA_, __OPENCHAMBER_UPDATE_PWA_

References

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