Threats Tagged 'cve-2026-49757'
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Threats Tagged 'cve-2026-49757'
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0 CVE-2026-49757 is a critical authentication bypass vulnerability in team-alembic's ash_authentication library affecting versions from 0.1.0 before 4.14.0 and from 5.0.0-rc.0 before 5.0.0-rc.10. The flaw allows an attacker to take over local user accounts via OAuth2/OIDC sign-in by matching users based on email rather than the required unique OpenID Connect iss/sub claims. This enables an unauthenticated attacker who can register an OAuth provider account with a victim's email to impersonate that victim and gain their privileges. The issue arises because email addresses, including unverified or reused ones, were used as unique identifiers instead of the stable iss/sub combination. The fix involves resolving users by the (strategy, sub) identity and only linking by email if the email_verified claim is trusted. Join the discussion | CVE Database V5 | 06/15/2026, 10:07:17 UTC Added: 06/15/2026, 12:00:24 UTC |
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