CVE-2026-72723
Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags
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.
INFO
Published Date :
Aug. 10, 2026, 4:19 p.m.
Last Modified :
Aug. 10, 2026, 4:19 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-72723
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Discourse to version 2026.1.6 or later.
- Apply available security patches promptly.
- Review and restrict tag visibility settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72723.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72723 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72723
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72723 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72723 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 10, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'discourse', 'product': 'discourse', 'versions': [{'status': 'affected', 'version': '< 2026.1.6'}, {'status': 'affected', 'version': '>= 2026.5.0-latest, < 2026.5.2'}, {'status': 'affected', 'version': '>= 2026.6.0-latest, < 2026.6.1'}, {'status': 'affected', 'version': '>= 2026.7.0-latest, < 2026.7.0'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-862 Added Reference https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9 Added Reference https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7 Added Reference https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac Added Reference https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde Added Reference https://github.com/discourse/discourse/pull/42091 Added Reference https://github.com/discourse/discourse/pull/42092 Added Reference https://github.com/discourse/discourse/pull/42093 Added Reference https://github.com/discourse/discourse/pull/42094 Added Reference https://github.com/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p