CVE-2026-29191 ZITADEL: 1-Click Account Takeover via XSS in /saml-post Endpoint
Attackers can execute cross-site scripting in the SAML POST endpoint to take over user accounts in ZITADEL.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-29191?
CVE-2026-29191 is a critical cross-site scripting vulnerability in zitadel, published on 7 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-29191?
5 open source packages ship an affected version, including github.com/zitadel/zitadel and github.com/zitadel/zitadel/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/zitadel/zitadel Go | All versions | None |
github.com/zitadel/zitadel Go | From 4.0.0 | 4.12.0 |
github.com/zitadel/zitadel Go | From 4.0.0 | 4.12.0 |
github.com/zitadel/zitadel/v2 Go | From 4.0.0 | 4.12.0 |
github.com/zitadel/zitadel/v2 Go | From 4.0.0 | 4.12.0 |
Products include Zitadel Zitadel.
How do I fix CVE-2026-29191?
Upgrade github.com/zitadel/zitadel to 4.12.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-29191 being exploited?
There is no known exploitation of CVE-2026-29191 in the wild and no public exploit code.
Other vulnerabilities in zitadel
- CVE-2025-67494 ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login
- CVE-2025-27507 IDOR Vulnerabilities in ZITADEL's Admin API that Primarily Impact LDAP Configurations
- CVE-2025-64103 Zitadel Bypass Second Authentication Factor
- CVE-2025-31123 Zitadel Expired JWT Keys Usable for Authorization Grants
- CVE-2024-29891 ZITADEL Improper Content-Type Validation Leads to Account Takeover via Stored XSS + CSP Bypass
Sources
Also known as GHSA-pr34-2v5x-6qjq, GO-2026-4607.