CVE-2026-77912 Stored cross-site scripting vulnerability in GitHub Enterprise Server allowed HTML attribute injection via the Markdown rendering pipeline

A stored cross-site scripting XSS vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to inject arbitrary HTML attributes into rendered Markdown because the Markdown rendering pipeline rewrote quote characters in already-sanitized HTML without...

CVE-2026-77912

A stored cross-site scripting (XSS) vulnerability exists in GitHub Enterprise Server within the Markdown rendering pipeline . The flaw occurs because the pipeline rewrote quote characters in already-sanitized HTML without performing subsequent re-sanitization, allowing an authenticated attacker t...