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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
zitadel zitadel unaffected
Version Status Constraints
0 affected < 4.17.3
4.17.3 unaffected —
zitadel zitadel unaffected
Version Status Constraints
0 affected ≤ 4.19.4

No data.

No data.

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No data.

Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/zitadel/zitadel/security/advisories/GHSA-g8gj-gq47-xgf4 cve-icon cve-icon
https://www.vulncheck.com/advisories/zitadel-before-4.17.3-account-takeover-via-external-idp-linking cve-icon cve-icon
History

Sun, 04 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title ZITADEL before 4.17.3 Account Takeover via External IdP Linking
First Time appeared Zitadel
Zitadel zitadel
Weaknesses CWE-306
CPEs cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*
Vendors & Products Zitadel
Zitadel zitadel
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-04T13:10:02.024Z

Reserved: 2026-10-04T13:02:21.188Z

Link: CVE-2026-105207

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-04T15:16:31.677

Modified: 2026-10-04T15:16:31.793

Link: CVE-2026-105207

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-04T15:30:16Z

Weaknesses