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9.3

Zitadel Login Interface Allows Attackers to Hijack User Accounts

GHSA-pr34-2v5x-6qjq CVE-2026-29191 GHSA-pr34-2v5x-6qjq
Summary

Zitadel's login system for some versions had a security flaw that could allow hackers to take control of user accounts. This is a serious issue because it could lead to unauthorized access to sensitive information. The good news is that the issue has been fixed in a newer version of Zitadel, so it's essential to update to the latest version to protect your users.

What to do
  • Update github.com zitadel to version 4.12.0.
  • Update zitadel github.com/zitadel/zitadel to version 4.12.0.
  • Update zitadel github.com/zitadel/zitadel/v2 to version 4.12.0.
Affected software
VendorProductAffected versionsFix available
github.com zitadel > 4.0.0 , <= 4.12.0 4.12.0
github.com zitadel > 4.0.0 , <= 4.12.0 4.12.0
zitadel github.com/zitadel/zitadel > 4.0.0 , <= 4.12.0 4.12.0
zitadel github.com/zitadel/zitadel/v2 > 4.0.0 , <= 4.12.0 4.12.0
zitadel zitadel > 4.0.0 , <= 4.12.0 –
Original title
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...
Original description
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.
ghsa CVSS3.1 9.3
Vulnerability type
CWE-79 Cross-site Scripting (XSS)
Published: 7 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026