CVE-2026-23511
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductZitadel
PublishedJan 15, 2026
First seenJan 15, 2026
Weakness typeCWE-204CWE-204
How to fix
Update
- zitadel zitadel3.4.6, 4.9.1 or later
- github.com/zitadel/zitadel4.9.1, 3.4.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zitadel zitadel | 2.0.0 ≤ v ≤ 2.71.19, 3.0.0 ≤ v < 3.4.6, 4.0.0 ≤ v < 4.9.1 | 3.4.6, 4.9.1 |
| github.com/zitadel/zitadelGo | 4.0.0 ≤ v < 4.9.1, v < 3.4.6, No range specified | 4.9.1, 3.4.6 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.