---
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'
---

## Overview

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.

## Affected

- `github.com/google/sam >= 0.1.0-alpha.1 < 0.1.0-alpha.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.