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CVE-2026-72724 Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch

🗓️ 10 Aug 2026 15:59:53Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 30 Views

Discourse onebox handler resolves thread by thread_id before channel access check, exposing private chat content via IDOR.

Related
Affected
Refs
[
  {
    "vendor": "discourse",
    "product": "discourse",
    "versions": [
      {
        "version": "< 2026.1.6",
        "status": "affected"
      },
      {
        "version": ">= 2026.5.0-latest, < 2026.5.2",
        "status": "affected"
      },
      {
        "version": ">= 2026.6.0-latest, < 2026.6.1",
        "status": "affected"
      },
      {
        "version": ">= 2026.7.0-latest, < 2026.7.0",
        "status": "affected"
      }
    ]
  }
]

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10 Aug 2026 15:59Current
CVSS 3.14.3
EPSS0.00458
30