CVE-2026-8106: GitHub Enterprise Server

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: from 3.19.1, before 3.19.6 (fixed in 3.19.6); from 3.20.0, before 3.20.2 (fixed in 3.20.2)

Published 2026-05-07. Last modified 2026-06-17.