---
id: "CVE-2026-119127"
kind: "vulnerability"
aliases: ["CVE-2026-119127"]
title: "ZITADEL: forged host headers let attackers hijack password-reset links"
severity: "high"
cvss: 8.6
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["identity", "login-v2", "package", "self-hosted", "zitadel"]
not_affected_if: ["managed-hosting", "version-4.19.5-or-later"]
published_at: "2026-10-29T16:18:05+00:00"
first_seen_at: "2026-10-29T16:25:58+00:00"
updated_at: "2026-10-29T16:29:30+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119127", "first_seen_at": "2026-10-29T16:25:58+00:00"}]
---

# ZITADEL: forged host headers let attackers hijack password-reset links

ZITADEL's Login V2 UI builds password-reset, invite and email-verification links from untrusted host headers. An unauthenticated attacker who knows a victim's login name can get genuine emails pointing to their own host, capture the single-use codes, and take over the account, including instance administrators.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the ZITADEL version running in your deployment; the sources say versions 4.0.0 up to but not including `4.19.5` are affected.
- Check whether your reverse proxy or load balancer passes `x-zitadel-public-host`, `x-zitadel-forward-host` or `x-forwarded-host` headers from clients to ZITADEL.

## Fix

- ZITADEL: move to `4.19.5` or later.

## Timeline

- 2026-10-29T16:25:58+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119127

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_