CVE-2026-119127 ZITADEL - Host Header Injection

ZITADEL < 4.19.5 contains a host header injection caused by untrusted x-zitadel-public-host, x-zitadel-forward-host, or x-forwarded-host headers in Login V2 UI, letting unauthenticated attackers poison email links and take over accounts.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.28% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Host Header Injection
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Published
29 October 2026
Updated
31 October 2026
Weakness
CWE-640

Vendor fix

Update to version 4.19.5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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