What is CVE-2026-29191?

CVE-2026-29191 is a critical-severity vulnerability in Zitadel, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-03-07.

How severe is CVE-2026-29191?

Critical severity. CVSS v3 base score is 9.3 out of 10.

XSS in Zitadel

CVE-2026-29191

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (32.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Zitadel — versions >= 4.0.0, < 4.12.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-29191?: CVE-2026-29191 is a critical-severity vulnerability in Zitadel, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-03-07.
How severe is CVE-2026-29191?: Critical severity. CVSS v3 base score is 9.3 out of 10.