CVE-2026-33527: Parse Server's Session Update endpoint allows overwriting server-generated session fields

March 24, 2026

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.

References

github.com/advisories/GHSA-jc39-686j-wp6q
github.com/parse-community/parse-server
github.com/parse-community/parse-server/pull/10263
github.com/parse-community/parse-server/pull/10264
github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q
nvd.nist.gov/vuln/detail/CVE-2026-33527

Code Behaviors & Features

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