Node.js CVE-2026-30938
MEDIUM
GHSA-q342-9w2p-57fp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
Parse Server versions prior to 8.6.12 and 9.5.1-alpha.1 allow attackers to bypass the requestKeywordDenylist security control by nesting prohibited keywords within objects or arrays in request payloads, enabling injection of restricted data into applications. This logic flaw affects all Parse Server deployments since the denylist is enabled by default, and custom keyword restrictions configured by developers are equally vulnerable to the same bypassing technique. Attackers can exploit this to inject malicious content or bypass access controls on any Parse Server instance.
Technical ContextAI
Classified as CWE-693 (Protection Mechanism Failure). Affects Parse-Server. 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 s
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 8.6.12. Restrict network access to the affected service where possible.
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Same weakness CWE-693 – Protection Mechanism Failure
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External POC / Exploit Code
Leaving vuln.today