CVE-2026-72723 json
Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags
published 2026-08-10 2 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2026-72723 , EUVD-2026-55660 , GHSA-4p6q-h74v-5j7p
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami discourse 2026.1.6, 2026.5.2, 2026.6.1
- discourse discourse 2026.1.6, 2026.5.2, 2026.6.1, 2026.7.0
- github.com/discourse/discourse@0248e9c commit
- github.com/discourse/discourse@03444dd commit
- github.com/discourse/discourse@900f51c commit
- github.com/discourse/discourse@da84c67 commit
- github.com/discourse/discourse#42091 pull request
- github.com/discourse/discourse#42092 pull request
- github.com/discourse/discourse#42093 pull request
- github.com/discourse/discourse#42094 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <2026.1.6 >=2026.5.0, <2026.5.2 >=2026.6.0, <2026.6.1 |
2026.1.6 2026.5.2 2026.6.1 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/discourse/discourse/pull/42091
web
-
github.com
/discourse/discourse/pull/42092
web
-
github.com
/discourse/discourse/pull/42093
web
-
github.com
/discourse/discourse/pull/42094
web
-
github.com
/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9
web
-
github.com
/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7
web
-
github.com
/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac
web
-
github.com
/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde
web
-
github.com
/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-72723
web
Sources
- CVE List CVE-2026-72723
- NVD CVE-2026-72723
- OSV BIT-discourse-2026-72723
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.