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CVE-2026-72728 Discourse: Onebox iframe origin allowlist enforces URL authority boundary

🗓️ 10 Aug 2026 16:13:20Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 4 Views

Discourse Onebox iframe allowlist bypass allows authenticated users to embed malicious content in sites.

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12 Aug 2026 04:19Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.16.3
4