Auth bypass in Parse-Community Parse-Server
CVE-2026-33527
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.57 and 9.6.0-alpha.48, an authenticated user can overwrite server-generated session fields such as expiresAt and createdWith when updating their own session via the REST API. This allows bypassing the server's configured session lifetime policy, making a session effectively permanent. This issue has been patched in versions 8.6.57 and 9.6.0-alpha.48.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% 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: 0.003 · change: +0.001
Affected products
- Parse-Community Parse-Server — versions < 8.6.57, >= 9.0.0, < 9.6.0-alpha.48
- Parseplatform Parse-Server — versions 9.6.0
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q (Vendor Advisory)
- github.com/parse-community/parse-server/pull/10263 (Issue Tracking)
- github.com/parse-community/parse-server/pull/10264 (Issue Tracking)
- github.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff… (Patch)
- github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff5781… (Patch)
Frequently asked questions
- What is CVE-2026-33527?
- CVE-2026-33527 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-03-24.
- How severe is CVE-2026-33527?
- Medium severity. CVSS v3 base score is 4.3 out of 10.