Parse Server has a session field immutability bypass via falsy-value guard
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | parse-server | >= 9.0.0, < 9.7.0-alpha.14, < 8.6.69 | 9.7.0-alpha.14, 8.6.69 |
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-f6j3-w9v3-cq22
- https://nvd.nist.gov/vuln/detail/CVE-2026-34574
- https://github.com/parse-community/parse-server/pull/10347
- https://github.com/parse-community/parse-server/pull/10348
- https://github.com/parse-community/parse-server/commit/90802969fc713b7bc9733d7255c7519a6ed75d21
- https://github.com/parse-community/parse-server/commit/ebccd7fe2708007e62f705ee1c820a6766178777
- https://github.com/parse-community/parse-server
- 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- Weakness (CWE)
CWE-697- Platform
- npm
- Package
parse-server- Disclosed
- 01.04.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-f6j3-w9v3-cq22 - 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 has a session field immutability bypass via falsy-value guard this entry
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