Threat actors are exploiting a vulnerability in Gitea’s reverse-proxy authentication mechanism to access internet-accessible instances by supplying only a valid username. Specific to Gitea’s official Docker images, the critical-severity security defect is tracked as CVE-2026-20896 (CVSS score of 9.8) and can be exploited with a single HTTP header, Sysdig Sr. Director of Threat Research Michael Cla...