CVE-2026-34574

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`.

How to fix CVE-2026-34574

To remediate CVE-2026-34574, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.69 or later
• —upgrade to 9.7.0-alpha.14 or later

Is CVE-2026-34574 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.69, >= 9.0.0, < 9.7.0
• >= 9.0.0, < 9.7.0-alpha.14

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-34574
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/commit/90802969fc713b7bc9733d7255c7519a6ed75d21
• WEBgithub.com/parse-community/parse-server/commit/ebccd7fe2708007e62f705ee1c820a6766178777