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

CVSS 6.3 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProductVersion RangeStatus
discoursediscourse< 2026.1.7affected
>= 2026.6.0-latest, < 2026.6.2affected
>= 2026.7.0-latest, < 2026.7.1affected
>= 2026.8.0-latest, < 2026.8.0-latest.1affected
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I. Basic Information for CVE-2026-72728

Vulnerability Information
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Vulnerability Title
Discourse: Onebox iframe origin allowlist enforces URL authority boundary
Source: CVE Program / CVE List V5
Vulnerability Description
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 / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse社区开源的一个集成人工智能技术的论坛社区平台。 Discourse 2026.1.7之前版本存在输入验证错误漏洞，该漏洞源于对URL的验证不严格，可能导致经过身份验证的用户提交特制URL绕过Onebox白名单并在站点中嵌入恶意内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
discoursediscourse < 2026.1.7 -

II. Public POCs for CVE-2026-72728

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III. Intelligence Information for CVE-2026-72728

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Patches & Fixes for CVE-2026-72728 (1)

Vendor Advisories for CVE-2026-72728 (1)

Same Patch Batch · discourse · 2026-08-10 · 13 CVEs total

CVE-2026-727308.7 HIGHDiscourse: Stored XSS chat-transcript username unescaped in Rich Text Editor
CVE-2026-727317.1 HIGHDiscourse: Strip SQL comments and use non-recursive parameter interpolation in Data Explor
CVE-2026-727266.5 MEDIUMDiscourse: Unauthorized eavesdropping on private AI bot conversations.
CVE-2026-727206.4 MEDIUMDiscourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing
CVE-2026-727255.4 MEDIUMDiscourse: Stored XSS in staff action logs injects staff UI
CVE-2026-727215.3 MEDIUMDiscourse: Onebox Domain Blocklist Bypass via Case-Sensitive Comparison
CVE-2026-727235.3 MEDIUMDiscourse: Anonymous sidebar serialization exposes descriptions of category-restricted tag
CVE-2026-727274.8 MEDIUMDiscourse: Stored XSS in the moderation review queue
CVE-2026-727224.3 MEDIUMDiscourse: Duplicate lookup reveals restricted topic titles through canonicalized URLs
CVE-2026-727244.3 MEDIUMDiscourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismat
CVE-2026-727324.3 MEDIUMDiscourse: Templates endpoint exposes hidden tag names
CVE-2026-727292.0 LOWDiscourse: Stored XSS in discourse-local-dates plugin

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-20

V. Comments for CVE-2026-72728

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