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/parse-community/parse-server/pull/10263
- Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10264
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | parse-server | >= 9.0.0, < 9.6.0-alpha.48, < 8.6.57 | 9.6.0-alpha.48, 8.6.57 |
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-jc39-686j-wp6q
- https://nvd.nist.gov/vuln/detail/CVE-2026-33527
- 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/commit/26b628c8fb3cc79ea955374769eebcff6f8a8a73
- https://github.com/parse-community/parse-server/commit/ea68fc0b22a6056c9675149469ff57817f7cf984
- https://github.com/parse-community/parse-server
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-863- Platform
- npm
- Package
parse-server- Disclosed
- 24.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-jc39-686j-wp6q - CC BY 4.0
Vulnerability history: parse-server
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 116
- First → latest
- 06.2019 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 17
- High 49
- Medium 40
- Low 10
Disclosures per year
- 2019: 2
- 2020: 4
- 2021: 4
- 2022: 12
- 2023: 5
- 2024: 4
- 2025: 6
- 2026: 79
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Parse Server's Session Update endpoint allows overwriting server-generated session fields this entry
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