parse-community parse-server up to 8.6.6/9.5.0-alpha.5 Error Message regex information exposure

Summaryinfo

A vulnerability classified as problematic has been found in parse-community parse-server up to 8.6.6/9.5.0-alpha.5. The impacted element is an unknown function of the component Error Message Handler. The manipulation of the argument regex leads to information exposure. This vulnerability is referenced as CVE-2026-30835. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in parse-community parse-server up to 8.6.6/9.5.0-alpha.5 and classified as problematic. This issue affects some unknown processing of the component Error Message Handler. The manipulation of the argument regex with an unknown input leads to a information exposure vulnerability. Using CWE to declare the problem leads to CWE-209. The product generates an error message that includes sensitive information about its environment, users, or associated data. Impacted is confidentiality. The summary by CVE 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 advisory is shared at github.com. The identification of this vulnerability is CVE-2026-30835 since 03/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 8.6.7 or 9.5.0-alpha.6 eliminates this vulnerability.

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Productinfo

Vendor

• parse-community

Name

• parse-server

Version

• 8.6.0
• 8.6.1
• 8.6.2
• 8.6.3
• 8.6.4
• 8.6.5
• 8.6.6
• 9.5.0-alpha.0
• 9.5.0-alpha.1
• 9.5.0-alpha.2
• 9.5.0-alpha.3
• 9.5.0-alpha.4
• 9.5.0-alpha.5

Website

• Product: https://github.com/parse-community/parse-server/

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