{"id":"CVE-2026-103090","summary":"Unauthenticated Biscuit Credential Disclosure via GET /enroll/status in Google OSS Agent Mesh (SAM)","details":"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.","aliases":["GHSA-hp3x-79wr-rx66"],"modified":"2026-10-22T10:45:33.665587794Z","published":"2026-10-21T22:16:59.777Z","database_specific":{"cna_assigner":"Google","cwe_ids":["CWE-306","CWE-522"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103090.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103090.json"},{"type":"ADVISORY","url":"https://github.com/google/sam/releases/tag/v0.1.0-alpha.9"},{"type":"ADVISORY","url":"https://github.com/google/sam/security/advisories/GHSA-hp3x-79wr-rx66"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103090"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/google/agentmesh","events":[{"introduced":"ffc3e6072383ea6e9cf3fbadc7cf473db448b364"},{"fixed":"bcf9bc22e5f4bb00eb504c1ab5f55815e0e91f23"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"0.1.0-alpha.1"},{"fixed":"0.1.0-alpha.9"}],"source":"AFFECTED_FIELD"},{"source":"REFERENCES_TAG","original_tag":"v0.1.0-alpha.9","range":[{"fixed":"bcf9bc22e5f4bb00eb504c1ab5f55815e0e91f23"}]}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103090.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}