CVE-2026-72728 — Discourse: Onebox iframe origin allowlist enforces URL authority boundary
Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded mali…
Published: 2026-08-10 · CVSS: 6.3 · CVSS 3.1
Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7