FastMCP OAuth Proxy token reuse across MCP servers
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| jlowin | fastmcp | affected |
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No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Jlowin | Fastmcp |
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| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-5h2m-4q8j-pqpj | FastMCP OAuth Proxy token reuse across MCP servers |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.417% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:jlowin:fastmcp:*:*:*:*:*:*:*:* | |
| Metrics |
cvssV3_1
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cvssV3_1
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| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-1220 | |
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Jlowin
Jlowin fastmcp |
|
| Vendors & Products |
Jlowin
Jlowin fastmcp |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| Description | FastMCP is the standard framework for building MCP applications. Prior to version 2.14.2, the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for the MCP server, the token is issued for the base_url passed to the OAuthProxy during initialization. This issue has been patched 2.14.2. | |
| Title | FastMCP OAuth Proxy token reuse across MCP servers | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
cvssV4_0
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