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Advisories

ZITADEL before 4.17.3 Account Takeover via External IdP Linking

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severity
critical
date
Affecting

  • zitadel >= 0, < 4.17.3

  • zitadel <= 4.19.4

CWE
  • CWE-306 Missing Authentication for Critical Function
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
lucasdodgson, AdamKorcz, grvijayan, livio-a
Description
ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated attacker knowing a victim's login name can bind their own external IdP identity to the victim's account and then sign in as the victim.

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