What’s Vulnerable › Vulnerabilities

CVE-2023-36475: Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-28 · updated 2026-06-17
• Weakness: CWE-1321

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 5.5.2 and 6.2.1, an attacker can use a prototype pollution sink to trigger a remote code execution through the MongoDB BSON parser. A patch is available in versions 5.5.2 and 6.2.1.

Affected products

• parse-community parse-server: before 5.5.2; from 6.0.0 before 6.2.1 — fixed in 5.5.2, 6.2.1

How to fix

Upgrade to a fixed version: parse-community parse-server 5.5.2, 6.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/parse-community/parse-server/commit/3dd99dd80e27e5e1d99b42844180546d90c7aa90
• https://github.com/parse-community/parse-server/commit/5fad2928fb8ee17304abcdcf259932f827d8c81f
• https://github.com/parse-community/parse-server/issues/8674
• https://github.com/parse-community/parse-server/issues/8675
• https://github.com/parse-community/parse-server/releases/tag/5.5.2
• https://github.com/parse-community/parse-server/releases/tag/6.2.1
• https://github.com/parse-community/parse-server/security/advisories/GHSA-462x-c3jw-7vr6
• https://github.com/parse-community/parse-server/commit/3dd99dd80e27e5e1d99b42844180546d90c7aa90
• https://github.com/parse-community/parse-server/commit/5fad2928fb8ee17304abcdcf259932f827d8c81f
• https://github.com/parse-community/parse-server/issues/8674
• https://github.com/parse-community/parse-server/issues/8675
• https://github.com/parse-community/parse-server/releases/tag/5.5.2

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