🚨 CVE-2026-72728
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.
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GitHub
SECURITY: Onebox iframe origin allowlist enforces URL authority boundary · discourse/discourse@92eec47
A platform for community discussion. Free, open, simple. - SECURITY: Onebox iframe origin allowlist enforces URL authority boundary · discourse/discourse@92eec47
September 8, 2026 1
