Medium 4.8Published Jul 10, 2026

CVE-2026-56666ZITADEL: Auto-linking by email: IdP-side email verification is not checked

Updated under an hour ago (Oct 28, 2026, 6:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 4.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

zitadel zitadel zitadel:zitadel (from the name)	before 4.15.3	CNA record

References

References

https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79	x-refsource-confirm
https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f	x-refsource-misc
https://github.com/zitadel/zitadel/releases/tag/v4.15.3	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.