CVE-2026-29191 PUBLISHED

ZITADEL: 1-Click Account Takeover via XSS in /saml-post Endpoint

Assigner: GitHub_M
Reserved: 04.03.2026 Published: 07.03.2026 Updated: 07.03.2026

ZITADEL is an open source identity management platform. From version 4.0.0 to 4.11.1, a vulnerability in Zitadel's login V2 interface was discovered that allowed a possible account takeover via XSS in /saml-post Endpoint. This issue has been patched in version 4.12.0.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS Score: 9.3

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	zitadel
Product	zitadel
Versions	Version >= 4.0.0, < 4.12.0 is affected

References

https://github.com/zitadel/zitadel/security/advisories/GHSA-pr34-2v5x-6qjq

Problem Types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE