Vulnerability in Parse-Community Parse-Server
CVE-2026-33429
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Parse-Community Parse-Server — versions < 8.6.54, >= 9.0.0, < 9.6.0-alpha.43
- Parseplatform Parse-Server — versions 9.6.0
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-qpc3-fg4j-8hgm (Vendor Advisory)
- github.com/parse-community/parse-server/pull/10253 (Issue Tracking)
- github.com/parse-community/parse-server/pull/10254 (Issue Tracking)
- github.com/parse-community/parse-server/commit/0c0a0a5a37ca821d2553119f2cb3be35… (Patch)
- github.com/parse-community/parse-server/commit/c62eacaf38de86913f09240583448360… (Patch)
Frequently asked questions
- What is CVE-2026-33429?
- CVE-2026-33429 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2026-03-24.
- How severe is CVE-2026-33429?
- Medium severity. CVSS v3 base score is 5.3 out of 10.