CVE-2026-109372
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductZitadel
PublishedOct 12, 2026
First seenOct 12, 2026
Weakness typeCWE-287Improper authentication
How to fix
Update
- zitadel zitadel4.19.2 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zitadel zitadel | 3.0.0 ≤ v < 4.19.2 | 4.19.2 |
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