gpustack
: SAML callback trusts an unverified SAMLResponse, allowing authentication bypass and account takeover
Not on CISA's list of exploited flaws, and not in the news we track.
CVE-2026-102894Critical9.1
Black Shard's team can check your exposure to CVE-2026-102894 and take the fix off your plate.
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.
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Chance of exploitation in the next 30 days
0.26%
EPSS score from FIRST
Updated 13 Nov 2026, 12:04 UTC, 30 of 36 sources answering.
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