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CVE-2026-72723— Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1AI

T1115 · Clipboard Data

Affected Version Matrix 4

VendorProductVersion RangeStatus
discoursediscourse< 2026.1.6affected
>= 2026.5.0-latest, < 2026.5.2affected
>= 2026.6.0-latest, < 2026.6.1affected
>= 2026.7.0-latest, < 2026.7.0affected
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I. Basic Information for CVE-2026-72723

Vulnerability Information
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Vulnerability Title
Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags
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, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. 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:N/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

Affected Products

VendorProductAffected VersionsCPESubscribe
discoursediscourse < 2026.1.6 -

II. Public POCs for CVE-2026-72723

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III. Intelligence Information for CVE-2026-72723

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Patches & Fixes for CVE-2026-72723 (8)

Vendor Advisories for CVE-2026-72723 (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-2026-727286.3 MEDIUMDiscourse: Onebox iframe origin allowlist enforces URL authority boundary
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-2026-727274.8 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-862

V. Comments for CVE-2026-72723

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