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CVE-2026-30938

MEDIUM CVSS 4.0: 6.9 EPSS 0.06%
Updated Mar 10, 2026
Payload
Parameter Value
CVSS 6.9 (MEDIUM)
Fixed In 8.6.12
Type CWE-693
Vendor Payload
Public PoC No

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-alpha.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-alpha.1. Use a Cloud Code beforeSave trigger to validate incoming data for prohibited keywords across all classes.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption

CVSS Vector v4.0

Weakness Type (CWE)

CWE-693

References 3

https://github.com/parse-community/parse-server/releases/tag/8.6.12
security-advisories@github.com
https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.1
security-advisories@github.com
https://github.com/parse-community/parse-server/security/advisories/GHSA-q342-9…
security-advisories@github.com
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