ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1
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.
CVE-2026-109371
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-109371
zitadel
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "zitadel",
"product": "zitadel",
"versions": [
{
"status": "affected",
"version": "3.0.0",
"lessThan": "4.18.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.18.0",
"versionType": "semver"
}
],
"packageURL": "pkg:golang/github.com/zitadel/zitadel",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-109371
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28504 · Revision 1
- Added to Heist Feed
- Publisher date