Medium
Parse Server: Protected field change detection oracle via LiveQuery watch parameter
Type: advisorySources: OSV
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33429
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:45 UTC · Revision 1
Source evidence
Parse Server: Protected field change detection oracle via LiveQuery watch parameter
core-osv · Original sourcePublished 24 Mar 2026, 18:16 UTC
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43.
osv:CVE-2026-33429
Complete source record
{
"id": "c246709b7575cec7742b9a230ef99cf5ae6b8ee7dd273da0db50064e6e3b4da7",
"url": "https://osv.dev/vulnerability/CVE-2026-33429",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Parse Server: Protected field change detection oracle via LiveQuery watch parameter",
"summary": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43.",
"evidence": "osv:CVE-2026-33429",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-33429",
"aliases": [
"BIT-parse-2026-33429",
"CVE-2026-33429",
"GHSA-qpc3-fg4j-8hgm"
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"metrics": [
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"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
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"modified": "2026-10-28T02:30:31.005316165Z",
"provider": "osv",
"references": [
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"source_id": "core-osv",
"document_id": 497980,
"published_at": "2026-03-24T18:16:35.414+00:00"
}