parse-community/parse-server · Security
Parse Server's Session Update endpoint allows overwriting server-generated session fields
- GHSA ID
- GHSA-jc39-686j-wp6q
- CVE ID
- CVE-2026-33527
- Severity
- medium
- Published
- Updated
- CVSS
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CVSS v3
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CVSS v4
- 5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Description
Impact
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
CWEs
- CWE-863 · Incorrect Authorization
References
- 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/10264 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-33527 ↗
- https://github.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73 ↗
- https://github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984 ↗
- https://github.com/advisories/GHSA-jc39-686j-wp6q ↗