CVE-2026-33527
MEDIUM4.3EPSS 0.01%Parse Server's Session Update endpoint allows overwriting server-generated session fields
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
Affected packages (2)
- Bitnami/parsefrom 0, < 8.6.57, >= 9.0.0, < 9.6.0
- npm/parse-server>= 9.0.0, < 9.6.0-alpha.48
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-33527
- PATCHhttps://github.com/parse-community/parse-server
- WEBhttps://github.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73
- WEBhttps://github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984
- WEBhttps://github.com/parse-community/parse-server/pull/10263
- WEBhttps://github.com/parse-community/parse-server/pull/10264
- WEBhttps://github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q