User Enumeration Vulnerability in ZITADEL Identity Management Platform
CVE-2026-23511

5.3MEDIUM

Key Information:

Vendor

Zitadel

Status
Zitadel
Vendor
CVE Published:
15 January 2026

What is CVE-2026-23511?

ZITADEL, an open-source identity management platform, has been identified with a vulnerability in its login interfaces that permits user enumeration. This flaw enables an unauthenticated attacker to verify whether specific user accounts exist by systematically attempting to login using various usernames or user IDs. The vulnerability has been addressed in releases 4.9.1 and 3.4.6, which provide crucial security enhancements to mitigate this weakness.

Affected Version(s)

zitadel >= 4.0.0, < 4.9.1 < 4.0.0, 4.9.1

zitadel < 3.4.6 < 3.4.6

References

https://github.com/zitadel/zitadel/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/zitadel/zitadel/commit/b85ab69e4679b02...
x_refsource_MISC
https://github.com/zitadel/zitadel/commit/c300d4cc6a2775a...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.