CVE-2026-30949
March 10, 2026
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.5 and 8.6.18, the Keycloak authentication adapter does not validate the azp (authorized party) claim of Keycloak access tokens against the configured client-id. A valid access token issued by the same Keycloak realm for a different client application can be used to authenticate as any user on the Parse Server that uses the Keycloak adapter. This enables cross-application account takeover in multi-client Keycloak realms. All Parse Server deployments that use the Keycloak authentication adapter with a Keycloak realm that has multiple client applications are affected. This vulnerability is fixed in 9.5.2-alpha.5 and 8.6.18.
Affected Packages
https://github.com/parse-community/parse-server.git (GITHUB):
Affected version(s) >=9.0.0 <9.5.2-alpha.5Fix Suggestion:
Update to version 9.5.2-alpha.5https://github.com/parse-community/parse-server.git (GITHUB):
Affected version(s) >=2.0.0 <8.6.18Fix Suggestion:
Update to version 8.6.18parse-server (NPM):
Affected version(s) >=9.0.0 <9.5.2-alpha.5Fix Suggestion:
Update to version 9.5.2-alpha.5parse-server (NPM):
Affected version(s) >=1.0.0 <8.6.18Fix Suggestion:
Update to version 8.6.18Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Authentication
EPSS
Base Score:
0.03
