Auth bypass in Parse-Community Parse-Server
CVE-2026-33042
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.29 and 8.6.49, a user can sign up without providing credentials by sending an empty `authData` object, bypassing the username and password requirement. This allows the creation of authenticated sessions without proper credentials, even when anonymous users are disabled. The fix in 9.6.0-alpha.29 and 8.6.49 ensures that empty or non-actionable `authData` is treated the same as absent `authData` for the purpose of credential validation on new user creation. Username and password are now required when no valid auth provider data is present. As a workaround, use a Cloud Code `beforeSave` trigger on the `_User` class to reject signups where `authData` is empty and no username/password is provided.
Vulnerability class: Broken Authentication
EPSS: 0.003 (21.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Parse-community Parse-server — versions >= 9.0.0, < 9.6.0-alpha.29, < 8.6.49
- Parseplatform Parse-server — versions 9.6.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
Frequently asked questions
- What is CVE-2026-33042?
- CVE-2026-33042 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-03-18.
- How severe is CVE-2026-33042?
- Medium severity. CVSS v3 base score is 5.3 out of 10.