Harsha Hegde@HarshaHegde0
Mcp-go https://nvd.nist.gov/vuln/detail/cve-2026-123272 ChatCli https://nvd.nist.gov/vuln/detail/cve-2026-123271
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CVE-2026-123271
LOWCVSS 5.1 · MEDIUMSignal is active with 1 mentions in latest observed window
Immediate actions
- Track advisory updates for patch or workaround availability
Recommended action window: Monitor and triage in normal cycle
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.
0.0/ 10 priority
Sources & remediation
Other 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
Weakness type (CWE)
CWE-346
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
Threat summary
- 1 mentions across 1 observed day
What's happening
- 1 total mentions across 1 day