Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109372ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion

High 8.7

In plain English

A high-severity improper authentication in zitadel from zitadel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.4%top 68.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers with organization-administrator permission can register a SAML provider with their own signing key to obtain authenticated sessions as any user linked to another SAML provider on the instance, including in other organizations.

Affected products (as reported)

Vendor	Product	Versions
zitadel	zitadel	3.0.0 – before 4.19.2

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-x4c7-fpcx-w9q6) vendor-advisory
VulnCheck Advisory: ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion third-party-advisory