CVE-2026-91159

The open-source discussion platform Discourse is vulnerable to a stored oEmbed HTML injection (CWE-79) prior to versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9 . The root cause is that oEmbed processing treats an entire attacker-controlled HTML fragment as trusted if it contains an iframe fro...