CVE-2026-39381: Parse Server's Endpoint `/sessions/me` bypasses `_Session` `protectedFields`

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-07 · updated 2026-07-24
Weakness: CWE-863

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.8.0-alpha.7 and 8.6.75, the GET /sessions/me endpoint returns _Session fields that the server operator explicitly configured as protected via the protectedFields server option. Any authenticated user can retrieve their own session's protected fields with a single request. The equivalent GET /sessions and GET /sessions/:objectId endpoints correctly strip protected fields. This vulnerability is fixed in 9.8.0-alpha.7 and 8.6.75.

Affected products

parse-community parse-server: before 8.6.75; from 9.0.0 before 9.8.0; 9.8.0-alpha1, 9.8.0-alpha2, 9.8.0-alpha3, 9.8.0-alpha4, 9.8.0-alpha5, 9.8.0-alpha6 — fixed in 8.6.75, 9.8.0

How to fix

Upgrade to a fixed version: parse-community parse-server 8.6.75, 9.8.0. Check the vendor advisory for mitigations.

References

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