Parse Community Parse Server 8.6.90/9.10.1-alpha.9 Login Endpoint improper authorization

Summaryinfo

A vulnerability was found in Parse Community Parse Server 8.6.90/9.10.1-alpha.9. It has been classified as critical. This vulnerability affects unknown code of the component Login Endpoint. Performing a manipulation results in improper authorization. This vulnerability is cataloged as CVE-2026-101042. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Parse Community Parse Server 8.6.90/9.10.1-alpha.9. It has been classified as critical. This affects an unknown code block of the component Login Endpoint. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Parse Server is an open-source backend server. In versions >= 9.0.0 < 9.10.1-alpha.10 and >= 8.0.2 < 8.6.91, the code-based authentication adapters (GitHub, Google Play Games, Instagram, LINE, LinkedIn, Microsoft, QQ, Spotify, WeChat, Weibo) verify the client's authorization code with the external provider on signup and on provider linking, but not when authentication data is supplied together with a username and password on the login endpoint. As a result, a low-privileged authenticated user can attach an arbitrary, unverified provider identity to their own account without the provider ever being contacted, spoofing an external identity toward application logic that trusts the linked provider ID. An attacker can also pre-hijack accounts: by claiming the provider ID of a victim who has not yet linked that provider, the victim's later legitimate sign-in with that provider resolves to the attacker's account. Only deployments configuring one of the affected code-based auth adapters are impacted. Versions 9.10.1-alpha.10 and 8.6.91 fix the issue by running the adapter's credential verification on the login and challenge endpoints and rejecting a provider identity already linked to another user. As a workaround, disable the affected code-based auth adapters.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-101042 since 09/27/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 8.6.91 or 9.10.1-alpha.10 eliminates this vulnerability.

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Productinfo

Vendor

• Parse Community

Name

• Parse Server

Version

• 8.6.90
• 9.10.1-alpha.9

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