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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-72722— Discourse: Duplicate lookup reveals restricted topic titles through canonicalized URLs

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 2026.1.6之前版本、2026.5.2之前版本、2026.6.1之前版本和2026.7.0之前版本存在授权问题漏洞，该漏洞源于TopicLink.extract_from、TopicLink.ensure_entry_for和TopicLink.duplicate_lookup在处理内部链接时未一致执行Guardian.can_see?检查，可能导致已认证用户提交指向受限主题、私信或隐藏帖子的链接

CVSS 4.3 · Medium EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 4

VendorProduct Version RangeStatus
discourse discourse < 2026.1.6 affected
>= 2026.5.0-latest, < 2026.5.2 affected
>= 2026.6.0-latest, < 2026.6.1 affected
>= 2026.7.0-latest, < 2026.7.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-72722

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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: Duplicate lookup reveals restricted topic titles through canonicalized URLs
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, TopicLink.extract_from, TopicLink.ensure_entry_for, and TopicLink.duplicate_lookup do not consistently enforce Guardian.can_see? checks when processing internal links. An authenticated user can submit links to restricted topics, private messages, or hidden posts and receive canonicalized slugs or titles in the composer_messages duplicate_lookup response even though the targets are not visible to that user. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 授权问题漏洞
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 2026.1.6之前版本、2026.5.2之前版本、2026.6.1之前版本和2026.7.0之前版本存在授权问题漏洞，该漏洞源于TopicLink.extract_from、TopicLink.ensure_entry_for和TopicLink.duplicate_lookup在处理内部链接时未一致执行Guardian.can_see?检查，可能导致已认证用户提交指向受限主题、私信或隐藏帖子的链接
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 < 2026.1.6 -

II. Public POCs for CVE-2026-72722

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-72722

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-72722 (8)

Vendor Advisories for CVE-2026-72722 (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-2026-72728 6.3 MEDIUM Discourse: Onebox iframe origin allowlist enforces URL authority boundary
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-2026-72724 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-862

V. Comments for CVE-2026-72722

No comments yet

Leave a comment