CVE-2026-34574
EPSS 0.03%Parse Server has a session field immutability bypass via falsy-value guard
Published: 4/1/2026Modified: 4/6/2026
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`.
Affected packages (2)
- Bitnami/parsefrom 0, < 8.6.69, >= 9.0.0, < 9.7.0
- npm/parse-server>= 9.0.0, < 9.7.0-alpha.14
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-34574
- PATCHhttps://github.com/parse-community/parse-server
- WEBhttps://github.com/parse-community/parse-server/commit/90802969fc713b7bc9733d7255c7519a6ed75d21
- WEBhttps://github.com/parse-community/parse-server/commit/ebccd7fe2708007e62f705ee1c820a6766178777
- WEBhttps://github.com/parse-community/parse-server/pull/10347
- WEBhttps://github.com/parse-community/parse-server/pull/10348
- WEBhttps://github.com/parse-community/parse-server/security/advisories/GHSA-f6j3-w9v3-cq22