Parse Server has a session field immutability bypass via falsy-value guard
GHSA-f6j3-w9v3-cq22 · BIT-parse-2026-34574 · CVE-2026-34574
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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.
References
- WEB https://github.com/parse-community/parse-server/security/advisories/GHSA-f6j3-w9v3-cq22
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-34574
- WEB 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
- PACKAGE https://github.com/parse-community/parse-server
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