Automattic: GET /api/v2/url_info endpoint is vulnerable to Blind SSRF

Summary: GET /api/v2/urlinfo endpoint is vulnerable to Blind SSRF. I am able to hit both Internal and External services via url parameter by replacing with internal and external url. Platforms Affected: https://www.tumblr.com/ Steps To Reproduce: 1. Login to https://www.tumblr.com/ 2. Follow any...