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TI-2026-85212 Aliases CVE-2026-102894

Unverified SAML responses in GPUStack allow authentication bypass

Priority MEDIUM 47CWE-294Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-294.

Summary

GPUStack from 0.7.1 before 2.2.2 is affected. Its /auth/saml/callback endpoint accepts SAML responses without verifying their signature (CWE-347), so the identity inside a response is trusted. An unauthenticated remote attacker can sign in as any existing user, including an administrator, or create a non-administrator account, even when SAML is not configured. Captured signed responses can also be replayed.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00259 17th percentileScored 2026-11-07
Fix Fixed gpustack (gpustack): 2.2.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gpustackgpustack0.7.1 to before 2.2.22.2.2Patch availableCNA
  • gpustack Vendorgpustack Affected 0.7.1 to before 2.2.2 Fixed in 2.2.2 Patch available CNA

Remediation

Upgrade GPUStack to version 2.2.2, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA gpustack (gpustack) Fixed in 2.2.2

Timeline

  1. 2026-11-04 Threatist record created from CVE-2026-102894
  2. 2026-11-06 Priority changed: MEDIUM → LOW
  3. 2026-11-06 CISA SSVC decision points changed
  4. 2026-11-06 Priority changed: LOW → MEDIUM
  5. 2026-11-06 CISA SSVC decision points changed

References

Other 6

  • TI-2026-42223 GPUStack Unauthenticated Information Disclosure via Worker Endpoints CVSS 4.0HIGH 8.8
  • TI-2026-85210 Authentication bypass in GPUStack grants unauthenticated admin access CVSS 3.1CRITICAL 9.8
  • TI-2026-85224 Missing authorization in GPUStack cluster proxy exposes Kubernetes clusters CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences