MEDIUM 5.1 NVD
CVE-2026-123271
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 r
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.
References
- https://github.com/diillson/chatcli/blob/359eb27debc4de78289a9662551a51ab4528e16c/cli/mcp/
- https://github.com/diillson/chatcli/commit/951fe24b8e090eae86bf8edb13a788916b1e6c91
- https://github.com/diillson/chatcli/releases/tag/v1.215.2
- https://github.com/diillson/chatcli/security/advisories/GHSA-95vg-3r9c-2v5q
- https://www.vulncheck.com/advisories/chatcli-before-1.215.2-origin-validation-error-via-un
This medium severity vulnerability with a CVSS score of 5.1 was published on 2026-11-05 via NVD.
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