CVE-2026-33527 Parse Server: Session update endpoint allows overwriting server-generated session fields

What is CVE-2026-33527?

CVE-2026-33527 is a medium-severity vulnerability in Parseplatform Parse-Server, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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

Weakness: CWE-863

Which versions are affected by CVE-2026-33527?

5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.

Products include Parseplatform Parse-Server.

How do I fix CVE-2026-33527?

Upgrade parse-server to a fixed version for your release line: 8.6.57 or 9.6.0-alpha.48.

Is CVE-2026-33527 being exploited?

There is no known exploitation of CVE-2026-33527 in the wild and no public exploit code.

Other vulnerabilities in Parseplatform Parse-Server

• CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write Critical 10.0
• CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection Critical 10.0
• CVE-2022-24760 Command Injection in Parse server Critical 10.0
• CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter Critical 9.9
• CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution Critical 9.8

All Parseplatform Parse-Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-parse-2026-33527, GHSA-jc39-686j-wp6q.