CVE-2026-30949

EUVD-2026-10868
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
parseplatformparse-server
𝑥
< 8.6.18
parseplatformparse-server
9.0.0 ≤
𝑥
< 9.5.2
parseplatformparse-server
9.5.2:alpha1
parseplatformparse-server
9.5.2:alpha2
parseplatformparse-server
9.5.2:alpha3
parseplatformparse-server
9.5.2:alpha4
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/parse-community/parse-server/releases/tag/8.6.18
https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.5
https://github.com/parse-community/parse-server/security/advisories/GHSA-48mh-j4p5-7j9v