Incorrect authorization in Parse Server - CVE-2026-30854
Published: April 6, 2026
Vulnerability identifier: #VU124974
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-30854
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to incorrect authorization in the GraphQL introspection control for __type queries when processing __type queries nested inside inline fragments. A remote attacker can send a specially crafted GraphQL query to disclose sensitive information.
Only __type introspection is affected; __schema introspection is not affected. The issue is exposed when public introspection is disabled.
Affected software
Parse Server
How to mitigate CVE-2026-30854
Install security update from vendor's website.
Parse Server - update to 9.5.0 alpha.10