CVE-2026-33527

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.57 and 9.6.0, 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

How to fix CVE-2026-33527

To remediate CVE-2026-33527, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.57 or later
• —upgrade to 9.6.0-alpha.48 or later

Is CVE-2026-33527 being exploited?

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

Affected packages (2)

• from 0, < 8.6.57, >= 9.0.0, < 9.6.0
• >= 9.0.0, < 9.6.0-alpha.48

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-33527
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73
• WEBgithub.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984