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CVE

CVE-2026-105215

ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback
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CVE

CVE-2026-105215

ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback

ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into.

Package Versions Affected

Package Version
patch Availability
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105215.json, https://github.com/zitadel/zitadel/security/advisories/GHSA-738m-7888-jfv8, https://nvd.nist.gov/vuln/detail/CVE-2026-105215, https://www.vulncheck.com/advisories/zitadel-before-4.16.2-account-pre-hijacking-via-forged-external-idp-callback

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00339%
EPSS Percentile
0.27446%
Introduced Version
0,v2.0.0,v2.21.0-rc.1,v3.0.0-rc.1,v4.0.0-rc.1
Fix Available
bab1099cc92039cdb036d9ec0d29eb5f8208fdb8,v3.4.14,v4.16.2

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