{"id":"CVE-2026-103090","title":"Unauthenticated Biscuit Credential Disclosure via GET /enroll/status in Google OSS Agent Mesh (SAM)","summary":"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 Goo…","severity":"high","cvss":8.8,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-306","CWE-522"],"vendor":"Google","product":"github.com/google/sam","affected":["github.com/google/sam >= 0.1.0-alpha.1 < 0.1.0-alpha.9"],"published":"2026-10-21","updated":"2026-10-21","sourceUpdated":"2026-10-21T22:16:59.777Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103090","references":[{"url":"https://github.com/google/sam/security/advisories/GHSA-hp3x-79wr-rx66"},{"url":"https://github.com/google/sam/releases/tag/v0.1.0-alpha.9"}],"tags":["cve.org"],"ingestedAt":"2026-10-21T23:20:10.331Z","slug":"CVE-2026-103090","body":"## Overview\n\nMissing 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.\n\n## Affected\n\n- `github.com/google/sam >= 0.1.0-alpha.1 < 0.1.0-alpha.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}