Discourse: Don’t leak restricted tag group names via tag info_CVE-2026-47264

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    "lastseen": "",
    "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.",
    "published": "2026-06-12T20:26:38.847Z",
    "modified": "2026-06-12T20:26:38.847Z",
    "type": "cve",
    "title": "Discourse: Don't leak restricted tag group names via tag info",
    "source": "GitHub_M",
    "references": "https://github.com/discourse/discourse/security/advisories/GHSA-4q5q-6hh6-53x2",
    "id": "CVE-2026-47264",
    "bulletinFamily": "",
    "cwe": [
        "CWE-200"
    ],
    "cvelist": null,
    "sourceData": "discourse discourse >= 2026.1.0-latest, < 2026.1.4\ndiscourse discourse >= 2026.3.0-latest, < 2026.3.1\ndiscourse discourse >= 2026.4.0-latest, < 2026.4.1",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
        "version": "3.1"
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    "category_name": "CVE",
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    "product": "discourse",
    "version": ">= 2026.1.0-latest, < 2026.1.4",
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