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    "cveMetadata": {
        "cveId": "CVE-2026-103090",
        "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778",
        "state": "PUBLISHED",
        "assignerShortName": "Google",
        "dateReserved": "2026-09-30T01:36:22.449Z",
        "datePublished": "2026-10-21T22:16:59.777Z",
        "dateUpdated": "2026-10-30T17:26:26.361Z"
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                "orgId": "14ed7db2-1595-443d-9d34-6215bf890778",
                "shortName": "Google",
                "dateUpdated": "2026-10-21T22:16:59.777Z"
            },
            "title": "Unauthenticated Biscuit Credential Disclosure via GET /enroll/status in Google OSS Agent Mesh (SAM)",
            "datePublic": "2026-09-06T16:01:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-306",
                            "description": "CWE-306 Missing Authentication for Critical Function",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-522",
                            "description": "CWE-522 Insufficiently Protected Credentials",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-115",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-115 Authentication Bypass"
                        }
                    ]
                },
                {
                    "capecId": "CAPEC-633",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-633 Token Impersonation"
                        }
                    ]
                },
                {
                    "capecId": "CAPEC-60",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-60 Reusing Session IDs (aka Session Replay)"
                        }
                    ]
                }
            ],
            "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"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Missing Authentication for Critical Function (CWE-306) and Insufficiently Protected Credentials (CWE-522) in the control plane enrollment status handler (HandleEnrollStatus at GET /enroll/status in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow an unauthenticated remote attacker to retrieve an approved bootstrap-enrolled peer's signed Biscuit identity token by supplying a peer_id obtainable from the unauthenticated GET /info endpoint. A related flaw in POST /enroll allowed any bootstrap-token holder to re-fetch another peer's credential. An attacker can replay the disclosed Biscuit token as a bearer credential on /policies to read mesh authorization policies and on /routers/lease to overwrite advertised router multiaddrs. Users should upgrade to version 0.1.0-alpha.9 or later, which requires cryptographic proof of possession of the enrollment private key on credential-releasing endpoints, enforces rate limiting, and validates router lease addresses.",
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                            "value": "<p>Missing Authentication for Critical Function (CWE-306) and Insufficiently Protected Credentials (CWE-522) in the control plane enrollment status handler (HandleEnrollStatus at GET /enroll/status in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow an unauthenticated remote attacker to retrieve an approved bootstrap-enrolled peer's signed Biscuit identity token by supplying a peer_id obtainable from the unauthenticated GET /info endpoint. A related flaw in POST /enroll allowed any bootstrap-token holder to re-fetch another peer's credential. An attacker can replay the disclosed Biscuit token as a bearer credential on /policies to read mesh authorization policies and on /routers/lease to overwrite advertised router multiaddrs. Users should upgrade to version 0.1.0-alpha.9 or later, which requires cryptographic proof of possession of the enrollment private key on credential-releasing endpoints, enforces rate limiting, and validates router lease addresses.</p>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://github.com/google/sam/security/advisories/GHSA-hp3x-79wr-rx66",
                    "tags": [
                        "vendor-advisory"
                    ]
                },
                {
                    "url": "https://github.com/google/sam/releases/tag/v0.1.0-alpha.9",
                    "tags": [
                        "release-notes"
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                }
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                            "value": "GENERAL"
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                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "LOW",
                        "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": "HIGH",
                        "baseScore": 8.8,
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N"
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            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "makino-yuto",
                    "type": "finder"
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            "source": {
                "discovery": "EXTERNAL"
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        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/google/agentmesh/security/advisories/GHSA-hp3x-79wr-rx66",
                        "tags": [
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                "metrics": [
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-30T17:26:10.462604Z",
                                "id": "CVE-2026-103090",
                                "options": [
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                                        "Exploitation": "poc"
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                                        "Technical Impact": "partial"
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                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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                    "dateUpdated": "2026-10-30T17:26:26.361Z"
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