Vulnerability in Punkpeye Mcp-Remote
CVE-2026-108716
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind03/punkpeye-mcp-remote-device-code-cleartext-oauth-transport (third-party-advisory)
- github.com/punkpeye/mcp-remote/blob/v0.14.3/src/lib/device-authorization.ts (technical-description)
- github.com/punkpeye/mcp-remote/blob/v0.14.3/src/lib/client-credentials.ts (technical-description)
- github.com/punkpeye/mcp-remote (product)
- www.vulncheck.com/advisories/mcp-remote-0.8.0-through-0.14.3-cleartext-credenti… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108716?
- CVE-2026-108716 is a medium-severity vulnerability in Punkpeye Mcp-Remote, classified under Cleartext Transmission of Sensitive Information. CVSS score: 5.3/10. Published 2026-10-11.
- How severe is CVE-2026-108716?
- Medium severity. CVSS v3 base score is 5.3 out of 10.