Vulnerability DatabaseCVE-2026-119127
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CVE-2026-119127
Published:October 29, 2026
Updated:November 04, 2026
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.
Affected Packages
https://github.com/zitadel/zitadel.git (GITHUB):
Affected version(s) >=v2.71.18 <v4.19.5 || >=v3.4.3 <v4.19.5 || >=v4.6.0 <v4.19.5
Fix Suggestion:
Update to version v4.19.5
github.com/zitadel/zitadel (GO):
Affected version(s) >=v1.80.0-v2.20.0.20251029090537-72a5c33e6ac3 <v1.80.0-v2.20.0.20261015074342-a618740b5786 || >=v1.80.0-v2.20.0.20251208090149-df75be96ffdc <v1.80.0-v2.20.0.20261015074342-a618740b5786 || >=v1.80.0-v2.20.0.20251104151830-14038716e326 <v1.80.0-v2.20.0.20261015074342-a618740b5786 || >=v0.0.0-20260122061916-30d91cde584c <v1.80.0-v2.20.0.20261015074342-a618740b5786 || >=v1.80.0-v2.20.0.20251110085036-d7e9eddb7650 <v1.80.0-v2.20.0.20261015074342-a618740b5786 || >=v1.80.0-v2.20.0.20251112124840-33c51deb2040 <v1.80.0-v2.20.0.20261015074342-a618740b5786
Fix Suggestion:
Update to version v1.80.0-v2.20.0.20261015074342-a618740b5786
github.com/zitadel/zitadel (GO):
Affected version(s) >=v2.71.18 <v4.19.5 || >=v3.4.3 <v4.19.5 || >=v4.6.0 <v4.19.5
Fix Suggestion:
Update to version v4.19.5
Related Resources (4)
https://nvd.nist.gov/vuln/detail/CVE-2026-119127
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119127.json
https://github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76
https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-account-takeover-via-login-v2-host-header-injection
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CVSS v4
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Weak Password Recovery Mechanism for Forgotten Password
CWE-640
EPSS
Base Score:
0.28