CVE-2026-47264 json
Discourse: Don't leak restricted tag group names via tag info
published 2026-06-12 4 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2026-47264 , EUVD-2026-36561 , GHSA-4q5q-6hh6-53x2
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 12%
- public exploits
- 0
- none known
Summary
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, DetailedTagSerializer#tag_group_names returned every tag group a tag belonged to without filtering against the requesting user's visibility. With SiteSetting.tags_listed_by_group enabled, anonymous and unprivileged users hitting TagsController#info (which is exempt from requires_login) could read the names of tag groups restricted to specific user groups or non-visible categories. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
Patch / fix
- bitnami discourse 2026.1.4, 2026.3.1, 2026.4.1
- discourse discourse 2026.1.4, 2026.3.1, 2026.4.1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 12% 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 | >=2026.1.0, <2026.1.4 >=2026.3.0, <2026.3.1 >=2026.4.0, <2026.4.1 |
2026.1.4 2026.3.1 2026.4.1 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/discourse/discourse/security/advisories/GHSA-4q5q-6hh6-53x2
third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47264
web
Sources
- CVE List CVE-2026-47264
- NVD CVE-2026-47264
- OSV BIT-discourse-2026-47264
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.