Plane Webhook Allows Internal Network Access

Summary

An attacker with admin access to a Plane project can create a webhook that makes internal network requests, potentially exposing sensitive data. This issue has been fixed in version 1.2.3. Upgrade to the latest version to ensure security.

What to do

Update plane to version 1.2.3.

Affected software

Vendor	Product	Affected versions	Fix available
–	plane	<= 1.2.1	1.2.3
plane	plane	<= 1.2.3	–

Original title

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 worksp...

Original description

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.

ghsa CVSS3.1 8.5

Vulnerability type

CWE-918 Server-Side Request Forgery (SSRF)