CVE-2026-33429

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, 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

How to fix CVE-2026-33429

To remediate CVE-2026-33429, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.54 or later
• —upgrade to 9.6.0-alpha.43 or later

Is CVE-2026-33429 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.54, >= 9.0.0, < 9.6.0
• >= 9.0.0, < 9.6.0-alpha.43

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-33429
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/commit/0c0a0a5a37ca821d2553119f2cb3be35322eda4b
• WEBgithub.com/parse-community/parse-server/commit/c62eacaf38de86913f09240583448360b1cc8e67