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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Zitadel Zitadel
cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*
|
3.0.0
|
4.19.2
|
References 2
https://github.com/zitadel/zitadel/security/advisories/GHSA-x4c7-fpcx-w9q6
GitHub Security Advisory (GHSA-x4c7-fpcx-w9q6)
https://www.vulncheck.com/advisories/zitadel-3.0.0-before-4.19.2-account-takeov…
VulnCheck Advisory: ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion