Parse Server has denylist `requestKeywordDenylist` keyword scan bypass through nested object placement
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-30938
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 16:09 UTC · Revision 1
Source evidence
Parse Server has denylist `requestKeywordDenylist` keyword scan bypass through nested object placement
core-osv · Original sourcePublished 10 Mar 2026, 16:34 UTC
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.
osv:CVE-2026-30938
Complete source record
{
"id": "af2dbe85f1f662a3e223b9456b955304816b6da0aae8d1f80b0998f163db838c",
"url": "https://osv.dev/vulnerability/CVE-2026-30938",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Parse Server has denylist `requestKeywordDenylist` keyword scan bypass through nested object placement",
"summary": "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.",
"evidence": "osv:CVE-2026-30938",
"products": [],
"severity": "medium",
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"modified": "2026-10-28T02:30:51.107758997Z",
"provider": "osv",
"references": [
"https://github.com/parse-community/parse-server/releases/tag/8.6.12",
"https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30938.json",
"https://github.com/parse-community/parse-server/security/advisories/GHSA-q342-9w2p-57fp",
"https://nvd.nist.gov/vuln/detail/CVE-2026-30938"
],
"provider_metadata": {
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"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 519824,
"published_at": "2026-03-10T16:34:02.93+00:00"
}