Missing Authorization Vulnerability in ZITADEL Login V2
CVE-2026-119129

8.6HIGH

Key Information:

Vendor

Zitadel

Status
Zitadel
Vendor
CVE Published:
29 October 2026

What is CVE-2026-119129?

A vulnerability in ZITADEL's Login V2 version 3.0.0 through 3.4.15 and 4.0.0 prior to 4.19.5 enables attackers to exploit OAuth 2.0 device authorizations. This flaw allows malicious actors to send links containing their own user code to authenticated users, enabling them to gain access to the user's tokens without consent. Furthermore, this can lead to unauthorized access, bypassing project settings through the OIDC device authorization API.

Affected Version(s)

zitadel 4.0.0 < 4.19.5

zitadel 3.0.0 <= 3.4.15

zitadel 4.19.5

References

https://github.com/zitadel/zitadel/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/zitadel-3.0.0-throug...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

lucasdodgson
IAM-marco
livio-a
.