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TI-2026-58435 Aliases CVE-2026-85056GHSA-9993-rfwp-rhwf

ZITADEL: MFA bypass via session reuse in Login V2

Priority MEDIUM 41CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · 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. From 4.0.0 until 4.16.1, ZITADEL Login V2 creates a browser session after password verification and can reuse that session for a later authentication request without verifying a user's enrolled TOTP, OTP, or U2F second factor. When the MFA step is abandoned and login starts again, session-validity checks require MFA only when the organization enables Force MFA or Force MFA for local users only, so a voluntarily enrolled factor can be skipped while completing an OIDC or SAML callback for a customer application. Login V1, the ZITADEL Console, Management and Admin APIs, and user self-management are not affected. This issue is fixed in version 4.16.1.

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): 4.16.1github.com/zitadel/zitadel (Go): 1.80.0-v2.20.0.20260717062356-56f4798ed31f

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
zitadelzitadel4.0.0 to before 4.16.14.16.1Patch availableCNA
—github.com/zitadel/zitadel (Go)before 1.80.0-v2.20.0.20260717062356-56f4798ed31f1.80.0-v2.20.0.20260717062356-56f4798ed31fPatch availableGHSA-9993-rfwp-rhwf
  • zitadel Vendorzitadel Affected 4.0.0 to before 4.16.1 Fixed in 4.16.1 Patch available CNA
  • github.com/zitadel/zitadel (Go) Vendor— Affected before 1.80.0-v2.20.0.20260717062356-56f4798ed31f Fixed in 1.80.0-v2.20.0.20260717062356-56f4798ed31f Patch available GHSA-9993-rfwp-rhwf

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 4.16.1
  • Fix · GHSA-9993-rfwp-rhwf github.com/zitadel/zitadel (Go) Fixed in 1.80.0-v2.20.0.20260717062356-56f4798ed31f Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-85056
  2. 2026-10-03 Alias added: GHSA-9993-rfwp-rhwf

References

Other 5

  • 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