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.
PUBLISHED5.2CWE-863
Parse Server: Session update endpoint allows overwriting server-generated session fields
Problem type
Affected products
parse-community
parse-server
< 8.6.57 - AFFECTED
>= 9.0.0, < 9.6.0-alpha.48 - AFFECTED
References
https://github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q
https://github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q
https://github.com/parse-community/parse-server/pull/10263
https://github.com/parse-community/parse-server/pull/10263
https://github.com/parse-community/parse-server/pull/10264
https://github.com/parse-community/parse-server/pull/10264
https://github.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73
https://github.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73
https://github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984
https://github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984
GitHub Security Advisories
GHSA-jc39-686j-wp6q
Parse Server's Session Update endpoint allows overwriting server-generated session fields
https://github.com/advisories/GHSA-jc39-686j-wp6qImpact
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.
Patches
The fix blocks authenticated users from setting expiresAt and createdWith fields when updating a session. Master key and maintenance key operations are not affected.
Workarounds
There is no known workaround other than upgrading.
Resources
- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q
- Fix Parse Server 9: https://github.com/parse-community/parse-server/pull/10263
- Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10264
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-33527Click to expand
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