CVE-2026-108716
mcp-remote 0.8.0 through 0.14.3 Cleartext Credential Transmission via --device-code OAuth Grant
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-319 |
| Vendor | punkpeye |
| Product | mcp-remote |
| Published | Oct 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
punkpeye / mcp-remote
0.8.0 ≤ 0.14.3
References
hackmd.io: https://hackmd.io/@haind03/punkpeye-mcp-remote-device-code-cleartext-oauth-transport github.com: https://github.com/punkpeye/mcp-remote/blob/v0.14.3/src/lib/device-authorization.ts#L64-L170 github.com: https://github.com/punkpeye/mcp-remote/blob/v0.14.3/src/lib/client-credentials.ts#L37-L47 github.com: https://github.com/punkpeye/mcp-remote vulncheck.com: https://www.vulncheck.com/advisories/mcp-remote-0.8.0-through-0.14.3-cleartext-credential-transmission-via-device-code-oauth-grant
Credits
HaiND from the Post and Telecommunication Institute of Technology