Makeplane Plane up to 1.3.x OAuth Identity improper authentication

Summaryinfo

A vulnerability was found in Makeplane Plane up to 1.3.x. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component OAuth Identity Handler. Performing a manipulation results in improper authentication. This vulnerability is identified as CVE-2026-105640. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Makeplane Plane up to 1.3.x. This affects an unknown function of the component OAuth Identity Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Plane is an open-source project management tool. Prior to 1.4.0, Plane trusts email addresses returned by Gitea OAuth and by self-managed GitLab OAuth deployments where email confirmation is disabled, without verifying that the provider authenticated ownership of the address. An attacker can set an OAuth identity's unverified provider email to a victim's address, which Plane matches directly to the victim's existing local account. The attacker can then log in to the victim's Plane account without knowing the victim's password. GitHub, GitLab.com, and Google are not affected because those providers return verified email addresses. This issue is fixed in 1.4.0.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-105640 since 10/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.4.0 eliminates this vulnerability.

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Productinfo

Vendor

• Makeplane

Name

• Plane

Version

• 1.0
• 1.1
• 1.2
• 1.3

Website

• Product: https://github.com/makeplane/plane/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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