CVE-2026-33429 Parse Server: Protected field change detection oracle via LiveQuery watch parameter
Attackers can infer protected field values by observing LiveQuery update events, leaking sensitive data through a timing oracle.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33429?
CVE-2026-33429 is a medium-severity vulnerability in Parseplatform Parse-Server, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-203
Which versions are affected by CVE-2026-33429?
5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | All versions | 8.6.54 |
parse-server npm | All versions | 8.6.54 |
parse-server npm | From 9.0.0 | 9.6.0-alpha.43 |
parse-server npm | From 9.0.0 | 9.6.0-alpha.43 |
parse Bitnami | All versions | 8.6.54, 9.6.0 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-33429?
Upgrade parse-server to a fixed version for your release line: 8.6.54 or 9.6.0-alpha.43.
Is CVE-2026-33429 being exploited?
There is no known exploitation of CVE-2026-33429 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2026-33429, GHSA-qpc3-fg4j-8hgm.