Insecure Default Policy and Unrestricted OIDC Enrollment in Google OSS Agent Mesh (SAM)
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| SAM | unaffected |
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No data.
No data.
| Vendor | Product | Versions | ||||||||
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| Sam |
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No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.642% probability within 30 days)
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Google
Google sam |
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| Vendors & Products |
Google
Google sam |
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| Metrics |
ssvc
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| Description | Missing Authorization (CWE-862) and Initialization of a Resource with an Insecure Default (CWE-1188) in the MCP proxy (HandleStreamPassThrough in mcp_service.go) and OIDC registration flow (GET /info and POST /register in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow a remote attacker to self-enroll into the mesh and invoke arbitrary tools across all connected MCP backend nodes. Because GET /info publicly discloses OIDC configuration, POST /register auto-enrolls any valid OIDC token holder without claim filtering or ban checks, and the default policy binds sam:system:authenticated to wildcard services and targets, an attacker can obtain a mesh credential with full read, write, and execution access on backend services. Users should upgrade to version 0.1.0-alpha.9 or later, which enforces a fail-closed default policy, explicit policy-binding requirements on enrollment, and ban checks. | |
| Title | Insecure Default Policy and Unrestricted OIDC Enrollment in Google OSS Agent Mesh (SAM) | |
| Weaknesses | CWE-1188 CWE-200 CWE-306 CWE-862 CWE-863 |
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| References |
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| Metrics |
cvssV4_0
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