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Vulnerability · Published Jan 15, 2026 · Assigned by GitHub_M

CVE-2026-23511ZITADEL has a user enumeration vulnerability in Login UIs

Medium 5.3

In plain English

A medium-severity security flaw in zitadel from zitadel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 65.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/zitadel/zitadel4.9.1GHSA-pvm5-9frx-264r
Gogithub.com/zitadel/zitadel3.4.6GHSA-pvm5-9frx-264r
Gogithub.com/zitadel/zitadelno fix listedGO-2026-4319

Affected products (as reported)

VendorProductVersions
zitadel zitadel >= 4.0.0, < 4.9.1< 3.4.6

Weakness: CWE-204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References