Vulnerability identifier: #VU56141

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39138

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Parse Server
Web applications / Modules and components for CMS

Vendor: Parse Community

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in the "authProvider" field in "_Session" class. A remote attacker can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Parse Server: 4.0.0 - 4.5.0

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External links
http://github.com/parse-community/parse-server/commit/147bd9a3dc43391e92c36e05d5db860b04ca27db
http://github.com/parse-community/parse-server/releases/tag/4.5.1
http://github.com/parse-community/parse-server/security/advisories/GHSA-23r4-5mxp-c7g5

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.