CVE-2026-119127

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

State: Published
Severity: 8.6 High
Published: Oct 29, 2026
Updated: Oct 29, 2026
Reserved: Oct 29, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.6 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-640 Weak Password Recovery Mechanism for Forgotten Password

Affected Products

Product	Versions
zitadelzitadel	4.0.0 to before 4.19.5Affected 4.19.5Not affected

References

GitHub Security Advisory (GHSA-mchc-246r-6m76)vendor-advisory
VulnCheck Advisory: ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injectionthird-party-advisory

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