CVE-2026-123271
8 HIGHpublic exploit availablePublished 2026-11-05 · Updated 2026-11-05
AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.
NVD 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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Weaknesses
CWE-346
Public exploit & PoC references
- https://github.com/diillson/chatcli/blob/359eb27debc4de78289a9662551a51ab4528e16c/cli/mcp/oauth.go#L477-L493
- 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
All references
- https://github.com/diillson/chatcli/blob/359eb27debc4de78289a9662551a51ab4528e16c/cli/mcp/oauth.go#L477-L493
- 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-unvalidated-mcp-oauth-resource-indicator
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
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