EUVD-2026-92108
GHSA-639g-x9rp-hw3x
Severity by source
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
Unauthenticated network request to a reachable endpoint (AV:N/AC:L/PR:N) enables identity-binding account takeover with high confidentiality and integrity impact; no availability impact and scope unchanged.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Account pre-hijacking in ZITADEL lets an unauthenticated remote attacker create a user record already bound to a victim's external identity provider subject, so that the victim's later, legitimate external login is transparently signed into the attacker-controlled account. Affected deployments are ZITADEL before 3.4.14 and 4.x before 4.16.2 that still run the legacy hosted Login V1 UI with at least one external IdP configured; exploitation also requires the attacker to know a valid IDPConfigID and the victim's ExternalUserID, which tempers the 9.3 CVSS 4.0 rating (independent assessment: CVSS 3.1 AV:N/AC:L/PR:N/UI:N with high confidentiality and integrity impact). …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
No credit card · 7-day full trial
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target ZITADEL instance to use the hosted Login V1 UI (the legacy login flow) with at least one external identity provider configured, and the 'external account not found' registration endpoint must be reachable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority vulnerability, not a high-CVSS/low-real-risk case. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patches: upgrade the 3.x line to ZITADEL 3.4.14 or later and the 4.x line to 4.16.2 or later, following the guidance in GHSA-738m-7888-jfv8 (https://github.com/zitadel/zitadel/security/advisories/GHSA-738m-7888-jfv8) and the VulnCheck advisory (https://www.vulncheck.com/advisories/zitadel-before-4.16.2-account-pre-hijacking-via-forged-external-idp-callback). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all ZITADEL deployments running versions before 3.4.14 or 4.x before 4.16.2 with the legacy hosted Login V1 UI and at least one external IdP configured, and immediately disable external IdP logins or migrate to the newer Login V2 UI. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Zitadel is open-source identity infrastructure software. Rated critical severity (CVSS 9.1), this vulnerability is remot
ZITADEL is an identity infrastructure system. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable
Account takeover in ZITADEL affects instances running 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3: an unauthenticated r
Cross-organization account takeover in ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 allows an authenticated attacker
Stored XSS in ZITADEL identity management platform versions 4.0.0 to 4.11.1 allows unauthenticated attackers to inject p
Remote account takeover in ZITADEL versions before 4.17.1 allows unauthenticated attackers to compromise MFA-protected a
The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Ra
The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Ra
ZITADEL 4.x before 4.17.1 fails to check an organization's inactive state during Login V2 authentication, allowing users
Unauthenticated remote attackers who know a valid user's login name can enroll attacker-controlled multi-factor authenti
ZITADEL combines the ease of Auth0 and the versatility of Keycloak.**Actions**, introduced in ZITADEL **1.42.0** on the
ZITADEL Actions V1 on affected releases (3.0.0 through pre-3.4.13 and the 4.x line before 4.16.1) fails to restrict the
Same weakness CWE-290 – Authentication Bypass by Spoofing
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today