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TI-2025-35655 Aliases CVE-2025-57770

ZITADEL user enumeration vulnerability in login UI

Priority LOW 24CWE-203Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-203.

Summary

The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Versions 4.0.0 to 4.0.2, 3.0.0 to 3.3.6, and all versions prior to 2.71.15 are vulnerable to a username enumeration issue in the login interface. The login UI includes a security feature, Ignoring unknown usernames, that is intended to prevent username enumeration by returning a generic response for both valid and invalid usernames. This vulnerability allows an unauthenticated attacker to bypass this protection by submitting arbitrary userIDs to the select account page and distinguishing between valid and invalid accounts based on the system's response. For effective exploitation, an attacker needs to iterate through possible userIDs, but the impact can be limited by implementing rate limiting or similar measures. The issue has been patched in versions 4.0.3, 3.4.0, and 2.71.15.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00391 33rd percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 2.71.15, 3.4.0, 4.0.3

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 2.71.15; 3.0.0 to before 3.4.0; 4.0.0 to before 4.0.32.71.15, 3.4.0, 4.0.3Patch availableCNA
  • zitadel Vendorzitadel Affected before 2.71.15; 3.0.0 to before 3.4.0; 4.0.0 to before 4.0.3 Fixed in 2.71.15, 3.4.0, 4.0.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*before 2.71.15; 3.0.0 to before 3.4.0; 4.0.0 to before 4.0.3Vulnerablezitadel
  • cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* Versions before 2.71.15; 3.0.0 to before 3.4.0; 4.0.0 to before 4.0.3 Vulnerable ·zitadel

Remediation

  • Fix · CNA zitadel (zitadel) Fixed in 2.71.15, 3.4.0, 4.0.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-57770

References

Patch 1

Advisory 1

Other 4

  • TI-2024-26607 ZITADEL Vulnerable to Session Information Leakage CVSS 3.1MEDIUM 6.5
  • 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-2024-33224 Zitadel User Registration Bypass Vulnerability CVSS 3.1HIGH 7.5
  • TI-2024-31388 Service Users Deactivation not Working in Zitadel CVSS 3.1HIGH 8.1
  • TI-2026-23310 ZITADEL: Bypassing Zitadel Login Behavior and Security Policy in Login V2 CVSS 3.1HIGH 8.2
See all 46 →

Sources

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