makeplane up to 1.2.2 URL Validation webhook.py ip.is_loopback server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, has been found in makeplane plane up to 1.2.2. This issue affects the function ip.is_loopback of the file plane/app/serializers/webhook.py of the component URL Validation Handler. The manipulation leads to server-side request forgery. This vulnerability is referenced as CVE-2026-30242. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in makeplane plane up to 1.2.2. It has been rated as critical. This issue affects the function ip.is_loopback of the file plane/app/serializers/webhook.py of the component URL Validation Handler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Plane is an an open-source project management tool. Prior to version 1.2.3, the webhook URL validation in plane/app/serializers/webhook.py only checks ip.is_loopback, allowing attackers with workspace ADMIN role to create webhooks pointing to private/internal network addresses (10.x.x.x, 172.16.x.x, 192.168.x.x, 169.254.169.254, etc.). When webhook events fire, the server makes requests to these internal addresses and stores the response — enabling SSRF with full response read-back. This issue has been patched in version 1.2.3.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-30242 since 03/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.2.3 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• makeplane

Name

• plane

Version

• 1.2.0
• 1.2.1
• 1.2.2

Website

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

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