CVE-2026-30938

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.12 and 9.5.1, the requestKeywordDenylist security control can be bypassed by placing any nested object or array before a prohibited keyword in the request payload. This is caused by a logic bug that stops scanning sibling keys after encountering the first nested value. Any custom requestKeywordDenylist entries configured by the developer are equally by-passable using the same technique. All Parse Server deployments are affected. The requestKeywordDenylist is enabled by default. This vulnerability is fixed in 8.6.12 and 9.5.1. Use a Cloud Code beforeSave trigger to validate incoming data for prohibited keywords across all classes.

How to fix CVE-2026-30938

To remediate CVE-2026-30938, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.12 or later
• —upgrade to 8.6.12 or later

Is CVE-2026-30938 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.12, >= 9.0.0, < 9.5.1
• from 0, < 8.6.12

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-30938
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/releases/tag/8.6.12
• WEBgithub.com/parse-community/parse-server/releases/tag/9.5.1-alpha.1