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Advisories

ChatCLI before v1.215.2 Origin Validation Error via Unvalidated MCP OAuth Resource Indicator

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Severity
medium
Date
Affecting

  • ChatCLI >= v1.159.0, < v1.215.2

CWE
  • CWE-346 Origin Validation Error
CVSS
5.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Credit
Theodoros Lampropoulos, diillson
Description
ChatCLI before v1.215.2 contains an improper validation vulnerability in the MCP OAuth login flow that uses server-supplied Protected Resource Metadata as the resource indicator without checking it matches the configured server URL. A malicious MCP server can declare another resource on the same authorization server, obtain the user's bearer token for it, and replay that token against the other resource.

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