Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M

CVE-2026-33429Parse Server: Protected field change detection oracle via LiveQuery watch parameter

Medium 6.3

In plain English

A medium-severity security flaw in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.3%top 73.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	parse-server	9.6.0-alpha.43	GHSA-qpc3-fg4j-8hgm
npm	parse-server	8.6.54	GHSA-qpc3-fg4j-8hgm

Affected products (as reported)

Vendor	Product	Versions
parse-community	parse-server	< 8.6.54>= 9.0.0, < 9.6.0-alpha.43

Weakness: CWE-203 · Vector: 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

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-qpc3-fg4j-8hgm x_refsource_CONFIRM
https://github.com/parse-community/parse-server/pull/10253 x_refsource_MISC
https://github.com/parse-community/parse-server/pull/10254 x_refsource_MISC
https://github.com/parse-community/parse-server/commit/0c0a0a5a37ca821d2553119f2cb3be35322eda4b x_refsource_MISC
https://github.com/parse-community/parse-server/commit/c62eacaf38de86913f09240583448360b1cc8e67 x_refsource_MISC