GitHub Advisoryadvisory · npm
GHSA-f6j3-w9v3-cq22 Parse Server has a session field immutability bypass via falsy-value guard
MEDIUM
Official page ↗
- Aliases
- CVE-2026-34574
- Ecosystem
- npm
- Packages
- parse-server
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- Weaknesses
- CWE-697
- Reviewed
- 2026-04-01
Affected packages
• npm parse-server: >= 9.0.0, < 9.7.0-alpha.14 → fixed in 9.7.0-alpha.14
• npm parse-server: < 8.6.69 → fixed in 8.6.69
Description
Impact
An authenticated user can bypass the immutability guard on session fields (`expiresAt`, `createdWith`) by sending a null value in a PUT request to the session update endpoint. This allows nullifying the session expiry, making the session valid indefinitely and bypassing configured session length policies.
Patches
The truthiness-based guard checks were replaced with key-presence checks that reject any value for protected session fields, including null.
Workarounds
There is no known workaround. A `beforeSave` trigger on `_Session` could be used to reject null values for `expiresAt` and `createdWith`.
Related
Alias · CVE (1)
- CVE-2026-34574 Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. vulnerability
Weakness · CWE (1)
- CWE-697 Incorrect Comparison weakness
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-f6j3-w9v3-cq22 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-34574 advisory
- https://github.com/parse-community/parse-server/pull/10347 web
- https://github.com/parse-community/parse-server/pull/10348 web
- https://github.com/parse-community/parse-server/commit/90802969fc713b7bc9733d7255c7519a6ed75d21 web
- https://github.com/parse-community/parse-server/commit/ebccd7fe2708007e62f705ee1c820a6766178777 web
- https://github.com/parse-community/parse-server package