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TI-2026-18935 Aliases CVE-2026-23511GHSA-pvm5-9frx-264r

ZITADEL has a user enumeration vulnerability in Login UIs

Priority LOW 30CWE-204Published · 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 and GitHub. Impact type from CWE-204.

Summary

ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00402 34th percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.9.1, 3.4.6github.com/zitadel/zitadel (Go): 4.9.1, 3.4.6

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 4.9.1; before 3.4.64.9.1, 3.4.6Patch availableCNA
—github.com/zitadel/zitadel (Go)4.0.0 to before 4.9.14.9.1Patch availableGHSA-pvm5-9frx-264r
—github.com/zitadel/zitadel (Go)before 3.4.63.4.6Patch availableGHSA-pvm5-9frx-264r
  • zitadel Vendorzitadel Affected 4.0.0 to before 4.9.1; before 3.4.6 Fixed in 4.9.1, 3.4.6 Patch available CNA
  • github.com/zitadel/zitadel (Go) Vendor— Affected 4.0.0 to before 4.9.1 Fixed in 4.9.1 Patch available GHSA-pvm5-9frx-264r
  • github.com/zitadel/zitadel (Go) Vendor— Affected before 3.4.6 Fixed in 3.4.6 Patch available GHSA-pvm5-9frx-264r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*2.0.0 – 2.71.19; 3.0.0 to before 3.4.6; 4.0.0 to before 4.9.1Vulnerablezitadel
  • cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* Versions 2.0.0 – 2.71.19; 3.0.0 to before 3.4.6; 4.0.0 to before 4.9.1 Vulnerable ·zitadel

Remediation

  • Fix · CNA zitadel (zitadel) Fixed in 4.9.1, 3.4.6
  • Fix · GHSA-pvm5-9frx-264r github.com/zitadel/zitadel (Go) Fixed in 4.9.1 Advisory →
  • Fix · GHSA-pvm5-9frx-264r github.com/zitadel/zitadel (Go) Fixed in 3.4.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23511
  2. 2026-10-03 Alias added: GHSA-pvm5-9frx-264r

References

Patch 2

Advisory 2

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