CVE-2026-72723 Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags
Unauthenticated attackers can view restricted tag names and descriptions via the site JSON endpoint, exposing category-restricted metadata.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72723?
CVE-2026-72723 is a medium-severity vulnerability in discourse, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-72723?
1 open source package ship an affected version, including discourse.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 2026.1.6, 2026.5.2, 2026.6.1 |
How do I fix CVE-2026-72723?
Upgrade discourse to a fixed version for your release line: 2026.1.6, 2026.5.2 or 2026.6.1.
Is CVE-2026-72723 being exploited?
There is no known exploitation of CVE-2026-72723 in the wild and no public exploit code.
Sources
Also known as BIT-discourse-2026-72723, GHSA-4p6q-h74v-5j7p.