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TI-2026-40850 Aliases CVE-2026-56666GHSA-992q-9gwp-7r79

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

Priority LOW 22CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00285 21st percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.15.3github.com/zitadel/zitadel (Go): 4.15.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
zitadelzitadelbefore 4.15.34.15.3Patch availableCNA
—github.com/zitadel/zitadel (Go)before 4.15.34.15.3Patch availableGHSA-992q-9gwp-7r79
  • zitadel Vendorzitadel Affected before 4.15.3 Fixed in 4.15.3 Patch available CNA
  • github.com/zitadel/zitadel (Go) Vendor— Affected before 4.15.3 Fixed in 4.15.3 Patch available GHSA-992q-9gwp-7r79

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*——zitadel
  • cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* Versions — — ·zitadel

Remediation

  • Fix · CNA zitadel (zitadel) Fixed in 4.15.3
  • Fix · GHSA-992q-9gwp-7r79 github.com/zitadel/zitadel (Go) Fixed in 4.15.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56666
  2. 2026-10-03 Alias added: GHSA-992q-9gwp-7r79

References

Advisory 1

Other 4

  • TI-2024-26607 ZITADEL Vulnerable to Session Information Leakage CVSS 3.1MEDIUM 6.5
  • TI-2026-67551 ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback CVSS 4.0CRITICAL 9.3
  • TI-2026-67543 ZITADEL before 4.17.3 Account Takeover via External IdP Linking CVSS 4.0CRITICAL 9.3
  • TI-2025-41253 ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login CVSS 3.1CRITICAL 9.3
  • TI-2025-39554 Zitadel Bypass Second Authentication Factor CVSS 4.0HIGH 8.7
  • TI-2026-82647 ZITADEL Login V2 flaw lets attackers approve device authorizations CVSS 4.0HIGH 8.6
See all 77 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences