GPUStack: SAML callback trusts an unverified SAMLResponse, allowing authentication bypass and account takeover

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102894
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 22:17:44 UTC
Updated2026-11-06 12:17:15 UTC
DescriptionGPUStack 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.002590000 probability, percentile 0.176170000 (date 2026-11-06)

Problem Types: CWE-294 | CWE-347 | CWE-294 CWE-294: Authentication Bypass by Capture-replay | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gpustack Gpustack affected >= 0.7.1, < 2.2.2 Not specified

References

ReferenceSourceLinkTags
github.com/gpustack/gpustack/security/advisories/GHSA-62m9-f875-rqw6 [email protected] github.com
github.com/gpustack/gpustack/commit/adc6d82be34e48390720a1361df616e2ea9d... [email protected] github.com
github.com/gpustack/gpustack/releases/tag/v2.2.2 [email protected] github.com
github.com/gpustack/gpustack/pull/5923 [email protected] github.com
github.com/gpustack/gpustack/commit/705edbe1b5feec63959306daecd640e1c70e... [email protected] github.com
github.com/gpustack/gpustack/pull/5753 [email protected] github.com
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