CVE-2026-109372GHSA-x4c7-fpcx-w9q6
ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion
zitadel zitadel
CVSS
9.3CriticalExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.37%Chance of exploitation activity in the next 30 days, higher than 29% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 4.19.2zitadelCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 2
- zitadelaffected: 3.0.0 before 4.19.2CVE List
- zitadelunaffected: 4.19.2CVE List