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Advisories

Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers

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Severity
high
Date
Affecting

  • sso >= 1.7.0-rc.2, < 1.7.3

CWE
  • CWE-287 Improper Authentication
CVSS
8.6
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
manus-use
Description
Better Auth @better-auth/sso from 1.7.0-rc.2 before 1.7.3 contains an authentication bypass vulnerability that allows authenticated users to sign in as other users by registering a personal SSO provider. Attackers can copy a legitimate provider's OIDC issuer or SAML entity ID and assert a victim's subject or NameID, because account lookup ignores providerId, creating sessions for victim accounts.

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