CVE-2026-30850: Parse Server: File metadata endpoint bypasses `beforeFind` / `afterFind` trigger authorization

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-07 · updated 2026-06-17
Weakness: CWE-862

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.9 and 9.5.0-alpha.9, the file metadata endpoint (GET /files/:appId/metadata/:filename) does not enforce beforeFind / afterFind file triggers. When these triggers are used as access-control gates, the metadata endpoint bypasses them entirely, allowing unauthorized access to file metadata. This issue has been patched in versions 8.6.9 and 9.5.0-alpha.9.

Affected products

parse-community parse-server: before 8.6.9; from 9.0.0 before 9.5.0; 9.5.0, 9.5.0-alpha1, 9.5.0-alpha2, 9.5.0-alpha3, 9.5.0-alpha4, 9.5.0-alpha5 (+3) — fixed in 8.6.9, 9.5.0

How to fix

Upgrade to a fixed version: parse-community parse-server 8.6.9, 9.5.0. Check the vendor advisory for mitigations.

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-hwx8-q9cg-mqmc

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