CVE-2026-30835
Parse Server: Malformed `$regex` query leaks database error details in API response
Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.7 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.
INFO
Published Date :
March 6, 2026, 9:16 p.m.
Last Modified :
March 11, 2026, 1:08 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Parse Server to version 8.6.7 or later.
- Update Parse Server to version 9.5.0-alpha.6 or later.
- Sanitize query parameters to prevent malformed regex issues.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-30835.
| URL | Resource |
|---|---|
| https://github.com/parse-community/parse-server/releases/tag/8.6.7 | Product Release Notes |
| https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.6 | Product Release Notes |
| https://github.com/parse-community/parse-server/security/advisories/GHSA-9cp7-3q5w-j92g | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-30835 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-30835
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-30835 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-30835 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* versions from (including) 9.0.0 up to (excluding) 9.5.0 *cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha1:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha2:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha3:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha4:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha5:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* versions up to (excluding) 8.6.7 Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/releases/tag/8.6.7 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.6 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/security/advisories/GHSA-9cp7-3q5w-j92g Types: Patch, Vendor Advisory -
New CVE Received by [email protected]
Mar. 06, 2026
Action Type Old Value New Value Added Description Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.7 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-209 Added Reference https://github.com/parse-community/parse-server/releases/tag/8.6.7 Added Reference https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.6 Added Reference https://github.com/parse-community/parse-server/security/advisories/GHSA-9cp7-3q5w-j92g