High severity · published Mar 10, 2026
CVE-2026-30949
Parse Server is missing audience validation in Keycloak authentication adapter
8.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
>= 9.0.0 < 9.5.2-alpha.5; < 8.6.18 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30949
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-30949
Product
https://github.com/parse-community/parse-server/releases/tag/8.6.18
Product
https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.5
Patch
https://github.com/parse-community/parse-server/security/advisories/GHSA-48mh-j4p5-7j9v
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