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CVE-2026-119127— ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection

Quick assessment

Affected
zitadel zitadel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZITADEL 4.0.0 至 4.19.5 之前的版本在登录 V2 用户界面中存在一个主机头注入漏洞。该漏洞允许未认证的攻击者通过提供不可信的 、 或 请求头，污染密码重置、邀请链接以及邮箱验证链接。若攻击者知晓受害者的登录名，即可将真实邮件中的链接指向其控制的服务器，在用户点击链接时窃取一次性验证码，进而接管账户，包括实例管理员账户。

CVSS 8.1 · High
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I. Basic Information for CVE-2026-119127

Vulnerability Information
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Vulnerability Title
ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
忘记口令恢复机制弱
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zitadel zitadel 4.0.0 ~ 4.19.5 -

II. Public POCs for CVE-2026-119127

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III. Intelligence Information for CVE-2026-119127

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Other References for CVE-2026-119127 (2)

Same Patch Batch · zitadel · 2026-10-29 · 3 CVEs total

CVE-2026-119129 8.1 HIGH ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.19.5 Account Takeover via Device Authoriza
CVE-2026-119128 7.4 HIGH ZITADEL 4.0.0 before 4.19.5 Login V2 Account Takeover via Forgeable verificationCheck Cook

IV. Related Vulnerabilities

Same product: zitadel
Same vendor: zitadel
Same weakness: CWE-640