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  4. CVE 2026 103091 insecure default policy and unrestricted oidc
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Back to active CVEs
Critical · CVSS 9.3CVE-2026-103091

Insecure Default Policy and Unrestricted OIDC Enrollment in Google OSS Agent Mesh (SAM)CVE-2026-103091

Answer in brief

CVE-2026-103091 records a Critical severity (CVSS 9.3) vulnerability in Insecure Default Policy and Unrestricted OIDC Enrollment in Google OSS Agent Mesh (SAM). The current sources do not mark it as known exploited. The current feed maps Google/SAM (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 19, 2026Updated Oct 19, 2026Source checked Oct 19, 2026First seen by HOL Oct 19, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Google/SAM (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Google/SAMgeneric>=0.1.0-alpha.1 <0.1.0-alpha.90.1.0-alpha.9

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Google/SAM.
  2. 2Review the reported fix. Update Google/SAM to 0.1.0-alpha.9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 19, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Missing Authorization (CWE-862) and Initialization of a Resource with an Insecure Default (CWE-1188) in the MCP proxy (HandleStreamPassThrough in mcp_service.go) and OIDC registration flow (GET /info and POST /register in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow a remote attacker to self-enroll into the mesh and invoke arbitrary tools across all connected MCP backend nodes. Because GET /info publicly discloses OIDC configuration, POST /register auto-enrolls any valid OIDC token holder without claim filtering or ban checks, and the default policy binds sam:system:authenticated to wildcard services and targets, an attacker can obtain a mesh credential with full read, write, and execution access on backend services. Users should upgrade to version 0.1.0-alpha.9 or later, which enforces a fail-closed default policy, explicit policy-binding requirements on enrollment, and ban checks.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)Same google/sam package
  • ActiveTrail for WooCommerce <= 1.2.6 - Unauthenticated Arbitrary Coupon CreationAlso CWE-862
  • light0011 cms Uploadify check-exists.php file_exists file information disclosureAlso CWE-200
  • aircheng-org iWebShop-5 Password Change system.php admin_repwd_act cross-site request forgeryAlso CWE-862
  • FormFlow for GoHighLevel <= 1.0.0 - Unauthenticated Sensitive Data Disclosure via Log FileAlso CWE-200
  • ElementsReady Addons for Elementor <= 6.7.2 - Unauthenticated Paid Download Access Bypass via 'downloadtype' ParameterAlso CWE-862

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-862, CWE-1188, CWE-306, CWE-863, CWE-200
Source
CVE List V5
Source checked
Oct 19, 2026
References
2 linked sources
Open source record