Log in / Sign up

Vulnerability details

CVE-2026-102894

gpustack gpustack

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

CVSS 3.1
9.1Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
9.1Critical 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

VendorProductVersionsSource
gpustack gpustack >= 0.7.1, < 2.2.2 CVEProject cvelistV5 (CNA)

References and advisories

6
Kolun on Telegram @kolunsec Exploited CVEs, key news and a daily digest Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published
2026-11-05
Last updated
2026-11-06
State
Published
Assigner (CNA)
GitHub_M
Kolun priority
18 · Low

Exploit prediction (EPSS)

0.25%
Probability of exploitation in 30 days
17.6%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-294
    Authentication Bypass by Capture-replay
  • CWE-347
    Improper Verification of Cryptographic Signature