parse-community parse-server up to 8.6.21/9.0.0 9.5.2-alpha.8 improper authentication

Summaryinfo

A vulnerability described as critical has been identified in parse-community parse-server up to 8.6.21/9.0.0 9.5.2-alpha.8. The impacted element is an unknown function. Executing a manipulation can lead to improper authentication. This vulnerability is handled as CVE-2026-30967. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in parse-community parse-server up to 8.6.21/9.0.0 9.5.2-alpha.8. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.9. and 8.6.22, the OAuth2 authentication adapter, when configured without the useridField option, only verifies that a token is active via the provider's token introspection endpoint, but does not verify that the token belongs to the user identified by authData.id. An attacker with any valid OAuth2 token from the same provider can authenticate as any other user. This affects any Parse Server deployment that uses the generic OAuth2 authentication adapter (configured with oauth2: true) without setting the useridField option. This vulnerability is fixed in 9.5.2-alpha.9. and 8.6.22.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-30967 since 03/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available.

Upgrading to version 8.6.22 or 9.0.0 9.5.2-alpha.9 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• parse-community

Name

• parse-server

Version

• 8.6.0
• 8.6.1
• 8.6.2
• 8.6.3
• 8.6.4
• 8.6.5
• 8.6.6
• 8.6.7
• 8.6.8
• 8.6.9
• 8.6.10
• 8.6.11
• 8.6.12
• 8.6.13
• 8.6.14
• 8.6.15
• 8.6.16
• 8.6.17
• 8.6.18
• 8.6.19
• 8.6.20
• 8.6.21
• 9.0.0 9.5.2-alpha.0
• 9.0.0 9.5.2-alpha.1
• 9.0.0 9.5.2-alpha.2
• 9.0.0 9.5.2-alpha.3
• 9.0.0 9.5.2-alpha.4
• 9.0.0 9.5.2-alpha.5
• 9.0.0 9.5.2-alpha.6
• 9.0.0 9.5.2-alpha.7
• 9.0.0 9.5.2-alpha.8

Website

• Product: https://github.com/parse-community/parse-server/

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