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TI-2026-67543 Aliases CVE-2026-105207GHSA-98x8-wvr5-pxqj

ZITADEL before 4.17.3 Account Takeover via External IdP Linking

Priority MEDIUM 48CWE-306Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0031 24th percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.17.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
zitadelzitadel4.0.0 to before 4.17.34.17.3Patch availableCNA
zitadelzitadel3.0.0 – 3.4.15—No fix listedCNA
  • zitadel Vendorzitadel Affected 4.0.0 to before 4.17.3 Fixed in 4.17.3 Patch available CNA
  • zitadel Vendorzitadel Affected 3.0.0 – 3.4.15 Fixed in — No fix listed CNA

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 4.17.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    zitadel 4.17.3

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-67544 ZITADEL before 4.17.3 Session Hijacking via Forgeable IdP Intent TokensPriority LOW 38
    • TI-2026-67542 ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User ServicePriority LOW 24
    Show all 3 records →

Timeline

  1. 2026-10-04 Threatist record created from CVE-2026-105207
  2. 2026-10-04 Alias added: GHSA-98x8-wvr5-pxqj
  3. 2026-10-07 CISA SSVC decision points changed
  4. 2026-10-29 Affected versions changed · CNA

References

Advisory 1

  • 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-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
  • TI-2026-71183 Missing authentication in ZITADEL Login V1 lets attackers rename users CVSS 4.0HIGH 8.8
See all 77 →

Sources

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