Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M
CVE-2026-33527Parse Server: Session update endpoint allows overwriting server-generated session fields
Medium 5.3
In plain English
A medium-severity incorrect authorization in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.6.0-alpha.48 | GHSA-jc39-686j-wp6q |
| npm | parse-server | 8.6.57 | GHSA-jc39-686j-wp6q |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | < 8.6.57>= 9.0.0, < 9.6.0-alpha.48 |
Weakness: CWE-863 · Vector: 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
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10263 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10264 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984 x_refsource_MISC