CVE-2026-102894
GPUStack: SAML callback trusts an unverified SAMLResponse, allowing authentication bypass and account takeover
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| gpustack gpustack |
>= 0.7.1, < 2.2.2 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 9.1 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CNA: GitHub_M |
| 3.1 / 9.1 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/gpustack/gpustack/security/advisories/GHSA-62m9-f875-rqw6CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/gpustack/gpustack/pull/5753CNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/pull/5923CNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/commit/705edbe1b5feec63959306daecd640e1c70eced2CNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/commit/adc6d82be34e48390720a1361df616e2ea9d6d45CNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/releases/tag/v2.2.2CNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/commit/705edbe1b5feec63959306daecd640e1c70eced2[email protected]
- https://github.com/gpustack/gpustack/commit/adc6d82be34e48390720a1361df616e2ea9d6d45[email protected]
- https://github.com/gpustack/gpustack/pull/5753[email protected]
- https://github.com/gpustack/gpustack/pull/5923[email protected]
- https://github.com/gpustack/gpustack/releases/tag/v2.2.2[email protected]
- https://github.com/gpustack/gpustack/security/advisories/GHSA-62m9-f875-rqw6[email protected]
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