CVE-2026-102894 (GCVE-0-2026-102894)

Vulnerability from cvelistv5 – Published: 2026-11-04 21:18 – Updated: 2026-11-06 11:34
VLAI
Title
GPUStack: SAML callback trusts an unverified SAMLResponse, allowing authentication bypass and account takeover
Summary
GPUStack is an open-source GPU cluster manager for AI model serving and GPU instance provisioning. From 0.7.1 until 2.2.2, the /auth/saml/callback endpoint decoded SAML XML, used its NameID and attributes to resolve or provision a user, and minted a gpustack_session JWT without calling OneLogin_Saml2_Auth.process_response to verify the signature, issuer, audience, destination, or time conditions. Any network client could submit an identity for an existing user, including an administrator, or provision a new non-administrator account, even when SAML was not configured. Response and Assertion identifiers were not consumed, so captured signed responses could also be replayed. This issue is fixed in version 2.2.2.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 04:56 UTC
CWE
  • CWE-294 - Authentication Bypass by Capture-replay
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
gpustack gpustack Affected: >= 0.7.1, < 2.2.2
Create a notification for this product.
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