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

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Summary

CVECVE-2026-56666
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 18:16:24 UTC
Updated2026-07-10 18:56:43 UTC
DescriptionZITADEL 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.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.001890000 probability, percentile 0.087230000 (date 2026-07-12)

Problem Types: CWE-287 | CWE-287 CWE-287: Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zitadel Zitadel affected < 4.15.3 Not specified

References

ReferenceSourceLinkTags
github.com/zitadel/zitadel/releases/tag/v4.15.3 [email protected] github.com
github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f [email protected] github.com
github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79 [email protected] github.com
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