CVE-2026-30949
HIGH
GHSA-48mh-j4p5-7j9v
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
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.
Analysis
Parse Server's Keycloak authentication adapter fails to validate the authorized party claim in access tokens, allowing tokens issued for one client application to authenticate users on another client within the same Keycloak realm. An authenticated attacker with valid credentials to any client application can exploit this to perform cross-application account takeover against Parse Server instances using Keycloak authentication in multi-client environments. …
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Remediation
Within 24 hours: Identify all Parse Server instances using Keycloak authentication and assess exposure scope. Within 7 days: Apply patches to all affected systems (upgrade to 9.5.2-alpha.5 or 8.6.18+). …
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