Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
discourse discourse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 6.3 · Medium EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
discourse discourse < 2026.1.7 affected
>= 2026.6.0-latest, < 2026.6.2 affected
>= 2026.7.0-latest, < 2026.7.1 affected
>= 2026.8.0-latest, < 2026.8.0-latest.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-72728

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

Vendor Product Affected Versions CPE Subscribe
discourse discourse < 2026.1.7 -

II. Public POCs for CVE-2026-72728

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-72728

请登录查看更多情报信息。

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-2026-72730 8.7 HIGH Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor
CVE-2026-72731 7.1 HIGH Discourse: Strip SQL comments and use non-recursive parameter interpolation in Data Explor
CVE-2026-72726 6.5 MEDIUM Discourse: Unauthorized eavesdropping on private AI bot conversations.
CVE-2026-72720 6.4 MEDIUM Discourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing
CVE-2026-72725 5.4 MEDIUM Discourse: Stored XSS in staff action logs injects staff UI
CVE-2026-72721 5.3 MEDIUM Discourse: Onebox Domain Blocklist Bypass via Case-Sensitive Comparison
CVE-2026-72723 5.3 MEDIUM Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tag
CVE-2026-72727 4.8 MEDIUM Discourse: Stored XSS in the moderation review queue
CVE-2026-72722 4.3 MEDIUM Discourse: Duplicate lookup reveals restricted topic titles through canonicalized URLs
CVE-2026-72724 4.3 MEDIUM Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismat
CVE-2026-72732 4.3 MEDIUM Discourse: Templates endpoint exposes hidden tag names
CVE-2026-72729 2.0 LOW Discourse: 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

No comments yet

Leave a comment