CVE-2026-33527
published 2026-03-24CVE-2026-33527: 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…
PriorityP423medium4.3CVSS 3.1
AVNACLPRLUINSUCNILAN
EPSS
0.26%
16.8th percentile
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.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| parse-community | parse-server | < 8.6.57 | 8.6.57 |
| parse-community | parse-server | — | — |
| parse-community | parse-server | >= 0 < 8.6.57 | 8.6.57 |
| parse-community | parse-server | >= 9.0.0 < 9.6.0-alpha.48 | 9.6.0-alpha.48 |
| parseplatform | parse-server | < 8.6.57 | 8.6.57 |
| parseplatform | parse-server | — | — |
| parseplatform | parse-server | >= 9.0.0 < 9.6.0 | 9.6.0 |
CVSS provenance
nvdv3.14.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
nvdv4.05.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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OSV
Parse Server's Session Update endpoint allows overwriting server-generated session fields
osv·2026-03-24
CVE-2026-33527 [MEDIUM] Parse Server's Session Update endpoint allows overwriting server-generated session fields
Parse Server's Session Update endpoint allows overwriting server-generated session fields
### 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/pars
GHSA
Parse Server's Session Update endpoint allows overwriting server-generated session fields
ghsa·2026-03-24
CVE-2026-33527 [MEDIUM] CWE-863 Parse Server's Session Update endpoint allows overwriting server-generated session fields
Parse Server's Session Update endpoint allows overwriting server-generated session fields
### 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/pars
No detection rules found.
No public exploits indexed.
https://github.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73https://github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984https://github.com/parse-community/parse-server/pull/10263https://github.com/parse-community/parse-server/pull/10264https://github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q
2026-03-24
Published