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        "cveId": "CVE-2026-103091",
        "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778",
        "state": "PUBLISHED",
        "assignerShortName": "Google",
        "dateReserved": "2026-09-30T01:36:24.048Z",
        "datePublished": "2026-10-19T02:24:35.225Z",
        "dateUpdated": "2026-10-19T17:44:31.625Z"
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                "orgId": "14ed7db2-1595-443d-9d34-6215bf890778",
                "shortName": "Google",
                "dateUpdated": "2026-10-19T02:24:35.225Z"
            },
            "title": "Insecure Default Policy and Unrestricted OIDC Enrollment in Google OSS Agent Mesh (SAM)",
            "datePublic": "2026-09-06T16:01:00.000Z",
            "problemTypes": [
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                    "descriptions": [
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                            "lang": "en",
                            "cweId": "CWE-862",
                            "description": "CWE-862 Missing Authorization",
                            "type": "CWE"
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                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-1188",
                            "description": "CWE-1188 Initialization of a Resource with an Insecure Default",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-306",
                            "description": "CWE-306 Missing Authentication for Critical Function",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-863",
                            "description": "CWE-863 Incorrect Authorization",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-200",
                            "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor",
                            "type": "CWE"
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                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-180",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-180 Exploiting Incorrectly Configured Access Control Security Levels"
                        }
                    ]
                },
                {
                    "capecId": "CAPEC-122",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-122 Privilege Abuse"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Google",
                    "product": "SAM",
                    "packageName": "github.com/google/sam",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0.1.0-alpha.1",
                            "lessThan": "0.1.0-alpha.9",
                            "versionType": "semver"
                        }
                    ],
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            ],
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                    "lang": "en",
                    "value": "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.",
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            ],
            "references": [
                {
                    "url": "https://github.com/google/sam/security/advisories/GHSA-cgmg-9xf6-rrgw",
                    "tags": [
                        "vendor-advisory"
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                },
                {
                    "url": "https://github.com/google/sam/releases/tag/v0.1.0-alpha.9",
                    "tags": [
                        "release-notes"
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                }
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                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "version": "4.0",
                        "baseSeverity": "CRITICAL",
                        "baseScore": 9.3,
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
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            "credits": [
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                    "lang": "en",
                    "value": "Eli Ainhorn (Noma Security)",
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            "source": {
                "discovery": "EXTERNAL"
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        "adp": [
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                        "url": "https://github.com/google/agentmesh/security/advisories/GHSA-cgmg-9xf6-rrgw",
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                                "timestamp": "2026-10-19T17:43:50.321526Z",
                                "id": "CVE-2026-103091",
                                "options": [
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                                        "Exploitation": "poc"
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                                        "Automatable": "no"
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                "title": "CISA ADP Vulnrichment",
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