CVE-2026-72723Network attack vector

Restricted tag disclosure via unfiltered anonymous serialization

Published Aug 10, 2026 · Updated Aug 10, 2026

Missing authorization in Discourse before 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0 allows remote attackers to read restricted tag metadata. SiteSerializer.anonymous_default_navigation_menu_tags serializes default sidebar tags for /site.json without applying DiscourseTagging.filter_visible to the anonymous viewer. Any site that places tags from inaccessible categories or restricted tag groups in the default navigation menu exposes their names and descriptions without authentication.

CVSS severity5.3
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Missing authorization in Discourse before 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0 allows remote attackers to read restricted tag metadata. SiteSerializer.anonymous_default_navigation_menu_tags serializes default sidebar tags for /site.json without applying DiscourseTagging.filter_visible to the anonymous viewer. Any site that places tags from inaccessible categories or restricted tag groups in the default navigation menu exposes their names and descriptions without authentication.

The record

CVE
CVE-2026-72723
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Discourse
Product
Discourse
Classifications
CWE-862
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.1.6
  2. Affected versionversion=>= 2026.5.0-latest, < 2026.5.2
  3. Affected versionversion=>= 2026.6.0-latest, < 2026.6.1
  4. Affected versionversion=>= 2026.7.0-latest, < 2026.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=< 2026.1.6; version=>= 2026.5.0-latest, < 2026.5.2; version=>= 2026.6.0-latest, < 2026.6.1; version=>= 2026.7.0-latest, < 2026.7.0

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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