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CVE-2026-30949

HIGH CVSS 4.0: 7.6 EPSS 0.02%
Updated Mar 10, 2026
Keycloak
Parameter Value
CVSS 7.6 (HIGH)
Fixed In 9.5.2
Type CWE-287 (Improper Authentication)
Vendor Keycloak
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic 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)

CWE-287 Improper Authentication

References 3

https://github.com/parse-community/parse-server/releases/tag/8.6.18
security-advisories@github.com
https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.5
security-advisories@github.com
https://github.com/parse-community/parse-server/security/advisories/GHSA-48mh-j…
security-advisories@github.com
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