CVE-2026-103090 (GCVE-0-2026-103090)

Vulnerability from cvelistv5 – Published: 2026-10-21 22:16 – Updated: 2026-10-21 22:16
VLAI
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 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.
Severity
8.8 (High)
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
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-522 - Insufficiently Protected Credentials
Assigner
Google CNA under the Google root
CNA scorecard B 77/100 over 39 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Google SAM Affected: 0.1.0-alpha.1 , < 0.1.0-alpha.9 (semver)
guessed Create a notification for this product.
Date Public
2026-09-06 16:01
Credits
makino-yuto
Show details on NVD website
To clipboard 

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