Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
Sign in to view the affected projects.
No advisories yet.
Thu, 05 Nov 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mark3labs
Mark3labs mcp-go |
|
| Vendors & Products |
Mark3labs
Mark3labs mcp-go |
Thu, 05 Nov 2026 19:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Mark3labs mcp-go before v1.2.1 contains an improper validation vulnerability in OAuthHandler.fetchServerMetadata that allows malicious MCP servers to obtain tokens for other resources by declaring arbitrary resources in well-known metadata. Attackers can declare a different MCP server as the RFC 8707 resource indicator, causing the authorization server to mint tokens the attacker replays against that resource. | |
| Title | mcp-go before v1.2.1 Origin Validation Error via Unvalidated Well-Known Protected Resource Metadata | |
| Weaknesses | CWE-346 | |
| References |
|
|
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-11-05T21:01:52.297Z
Reserved: 2026-11-05T18:19:12.668Z
Link: CVE-2026-123272
No data.
Status : Deferred
Published: 2026-11-05T19:17:20.713
Modified: 2026-11-05T21:18:45.960
Link: CVE-2026-123272
No data.
OpenCVE Enrichment
Updated: 2026-11-05T21:00:19Z