---
id: CVE-2026-108716
title: >-
  mcp-remote 0.8.0 through 0.14.3 contains a cleartext transmission
  vulnerability in authorizeWithDeviceCode that sends client secrets and
  receives tokens without enforcing HTTPS endpoints
summary: >-
  mcp-remote 0.8.0 through 0.14.3 contains a cleartext transmission
  vulnerability in authorizeWithDeviceCode that sends client secrets and
  receives tokens without enforcing HTTPS endpoints. When discovered device
  authorization and token en…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-319
published: '2026-10-11'
updated: '2026-10-11'
sourceUpdated: '2026-10-11T13:17:14.720'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108716'
references:
  - url: 'https://github.com/punkpeye/mcp-remote'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/punkpeye/mcp-remote/blob/v0.14.3/src/lib/client-credentials.ts#L37-L47
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/punkpeye/mcp-remote/blob/v0.14.3/src/lib/device-authorization.ts#L64-L170
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@haind03/punkpeye-mcp-remote-device-code-cleartext-oauth-transport
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/mcp-remote-0.8.0-through-0.14.3-cleartext-credential-transmission-via-device-code-oauth-grant
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-11T13:51:17.025Z'
---

## Overview

mcp-remote 0.8.0 through 0.14.3 contains a cleartext transmission vulnerability in authorizeWithDeviceCode that sends client secrets and receives tokens without enforcing HTTPS endpoints. When discovered device authorization and token endpoints are non-loopback http URLs, on-path network attackers can capture the client secret plus issued access and refresh tokens.

## Remediation

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