CVE-2026-119127

HIGH 8.1

ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

ZITADEL 4.0.0 before 4.19.5 contains a host header injection vulnerability in the Login V2 UI that allows unauthenticated attackers to poison password-reset, invite, and email-verification links by supplying untrusted x-zitadel-public-host, x-zitadel-forward-host, or x-forwarded-host headers. Attackers knowing a victim's login name can point the links in genuine emails at their host, harvest the single-use codes when the links are opened, and take over accounts including instance administrators.

CWE	CWE-640
Vendor	zitadel
Product	zitadel
Published	Oct 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

zitadel / zitadel

4.0.0 < 4.19.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76 vulncheck.com: https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-account-takeover-via-login-v2-host-header-injection

Credits

🔍 lucasdodgson livio-a wim07101993