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CVE-2026-33409

HIGH

Parse Server has an auth provider validation bypass on login via partial authData

Published March 19, 2026Updated March 30, 2026Source: osv

Summary

### Impact An authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token. This affects Parse Server deployments where the server option `allowExpiredAuthDataToken` is set to `true`. The default value is `false`. ### Patches Auth providers are now always validated on login, regardless of the `allowExpiredAuthDataToken` setting. The option `allowExpiredAuthDataToken` has been deprecated and will be removed in a future major version. ### Workarounds Set `allowExpiredAuthDataToken` to `false` (the default) or remove the option from the server configuration.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update parse-server to 8.6.52 or later
npm install parse-server@8.6.52
npm
Update parse-server to 9.6.0-alpha.41 or later
npm install parse-server@9.6.0-alpha.41

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

PackageEcosystemAffectedFixed In
parse-server
npm
All versions8.6.52
parse-server
npm
All versions9.6.0-alpha.41

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-287
    Improper AuthenticationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-33409?
Parse Server has an auth provider validation bypass on login via partial authData This vulnerability has been assigned a severity rating of HIGH (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-33409?
CVE-2026-33409 affects parse-server. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-33409 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-pfj7-wv7c-22pr
BIT-parse-2026-33409

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