CVE-2026-23511

low-risk
Published 2026-01-15

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.

Do I need to act?

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0.02% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Zitadel

References (5)

Patch https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10d...
Patch https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b85...
Release Notes https://github.com/zitadel/zitadel/releases/tag/v3.4.6
Release Notes https://github.com/zitadel/zitadel/releases/tag/v4.9.1
Third Party Advisory https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal