CVE-2026-109374

Medium

Description

ZITADEL 3.0.0 before 4.19.2 contains a privilege escalation vulnerability in OIDC token exchange that allows end-user impersonators to impersonate administrators including IAM_OWNER by bypassing the admin.impersonation check. Attackers holding IAM_END_USER_IMPERSONATOR or ORG_END_USER_IMPERSONATOR roles can sign in to relying applications as administrators with their roles and claims.

SeverityMedium

CVSS5.5

Exploit probability—

ProductZitadel

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Update

zitadel zitadel4.19.2 or later

Vendor advisories

github.com/zitadel/zitadel/security/advisories/GHSA-w4gv-rcwj-w6r5

Affected products

Product	Affected versions	Fixed in
zitadel zitadel	3.0.0 ≤ v < 4.19.2	4.19.2

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