| Package | Affected versions | Patched versions |
|---|---|---|
| parse-server | = 9.5.2≥ 9.0.0, < 9.5.2< 8.6.18 | 9.5.28.6.18 |
| parse-server | ≥ 9.0.0, < 9.5.2-alpha.5< 8.6.18 | 9.5.2-alpha.58.6.18 |
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.
The fix replaces the userinfo HTTP call with local JWT verification and enforces azp claim validation against the configured client-id.
None.
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