CVE-2026-119127

High

Description

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductZitadel

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-640CWE-640

How to fix

Update

zitadel zitadel4.19.5 or later

Vendor advisories

github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76

Affected products

Product	Affected versions	Fixed in
zitadel zitadel	4.0.0 ≤ v < 4.19.5	4.19.5

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