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.
History

Sat, 07 Nov 2026 07:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 04 Nov 2026 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Gpustack
Gpustack gpustack
Vendors & Products Gpustack
Gpustack gpustack

Wed, 04 Nov 2026 21:30:00 +0000

Type Values Removed Values Added
Description 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.
Title GPUStack: SAML callback trusts an unverified SAMLResponse, allowing authentication bypass and account takeover
Weaknesses CWE-294
CWE-347
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-11-04T21:18:29.009Z

Updated: 2026-11-06T11:34:16.663Z

Reserved: 2026-09-29T17:34:42.743Z

Link: CVE-2026-102894

cve-icon Vulnrichment

Updated: 2026-11-06T11:34:12.480Z

cve-icon NVD

Status : Deferred

Published: 2026-11-04T22:17:44.440

Modified: 2026-11-12T22:18:51.470

Link: CVE-2026-102894

cve-icon Redhat

No data.