CVE-2026-105207
CRITICAL
INFO
Priority: 0.03
BB Relevance:
79/100
Published: 2026-10-04
Modified: 2026-10-29
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
AT:
None
VC:
High
VI:
High
VA:
High
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.
Weakness Classification (1)
Affected Software (4)
References & Advisories (2)
vendor-advisory
third-party-advisory