PT-2026-57254 · Zitadel · Zitadel

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-56666

NVD

CVSS v3.1

4.8

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive provider account with a victim email address to be linked to the victim's local account. This issue is fixed in version 4.15.3.

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-56666

Affected Products

Zitadel

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-56666 · Security Note
• https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f · Note
• https://github.com/zitadel/zitadel/releases/tag/v4.15.3 · Note
• https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79 · Note