CVE-2026-47264 Details
Description
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.
A vulnerability in Discourse allows unprivileged and anonymous users to access restricted tag group names through the TagsController#info endpoint. This issue affects Discourse versions 2026.1.0-latest to prior to 2026.1.4, 2026.3.0-latest to prior to 2026.3.1, and 2026.4.0-latest to prior to 2026.4.1. The vulnerability arises because the DetailedTagSerializer#tag_group_names method returned all tag group associations without considering the visibility settings of the requesting user. With the SiteSetting.tags_listed_by_group option enabled, this lack of filtering allowed users to see tag group names tied to specific user groups or non-visible categories.
Users are advised to upgrade to Discourse versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 13, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/discourse/discourse/security/advisories/GHSA-4q5q-6hh6-53x2 | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| discourse discourse | < 2026.1.0 >= 2026.1.0, < 2026.1.4 >= 2026.3.0, < 2026.3.1 >= 2026.4.0, < 2026.4.1 2026.5.0 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 12, 2026 | New CVE Received | [email protected] |