CVE-2026-30835CWE-209

Parse Server: Malformed `$regex` query leaks database error details in API response

Medium · published March 6, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
35.4
In the wild
Unconfirmed
What it is

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.7 and 9.5.0-alpha.6, malformed $regex query parameter (e.g. [abc) causes the database to return a structured error object that is passed unsanitized through the API response. This leaks database internals such as error messages, error codes, code names, cluster timestamps, and topology details. The vulnerability is exploitable by any client that can send query requests, depending on the deployment's permission configuration. This issue has been patched in versions 8.6.7 and 9.5.0-alpha.6.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
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
EPSS
0.00421 · 35.4th percentile
Weakness
CWE-209 · Generation of Error Message Containing Sensitive Information
Published
2026-03-06T20:28Z
EPSS history
Timeline
  • 06 MAR 20:28Z
    Parse Server: Malformed `$regex` query leaks database error details in API response
    cvelistv5