CVE-2026-109371ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1
Updated under an hour ago ()
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EPSS puts the chance of exploitation in the next 30 days at 0.36%, higher than 29% of scored CVEs.
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ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the hosted Login V1 UI, where the change-username handler acts on the account bound to a login flow before any factor is verified. Unauthenticated attackers can submit a victim's login name and then post a new username to rename any active human user, including administrators, locking them out.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
- Weakness (CWE)
- CWE-306
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.36% (percentile 29)
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 12, 2026
Affected products
zitadel zitadel zitadel:zitadel (from the name) | from 3.0.0 before 4.18.0; 4.18.0 not affected | CNA record |
References
- https://github.com/zitadel/zitadel/security/advisories/GHSA-4hgj-wm6c-q7p2vendor-advisory
- https://www.vulncheck.com/advisories/zitadel-3.0.0-before-4.18.0-unauthenticated-username-change-via-login-v1third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.