CVE-2026-123271
High
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.
SeverityHigh
CVSS8.0
Exploit probability—
ProductChatCLI
PublishedNov 5, 2026
First seenNov 5, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- diillson ChatCLIv1.215.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| diillson ChatCLI | v1.159.0 ≤ v < v1.215.2 | v1.215.2 |
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