Medium severity · published Aug 10, 2026
CVE-2026-72723
Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags
5.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
< 2026.1.6; >= 2026.5.0-latest, < 2026.5.2; >= 2026.6.0-latest, < 2026.6.1; >= 2026.7.0-latest, < 2026.7.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-72723
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-72723
github.com
https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9
github.com
https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7
github.com
https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac
github.com
https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde
github.com
https://github.com/discourse/discourse/pull/42091
github.com
https://github.com/discourse/discourse/pull/42092
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