Discourse: Cross-site backup access via path traversal in multisite local backups_CVE-2026-45775

{
    "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, a path traversal vulnerability in Discourse backup handling could allow an authenticated administrator on one site in a multisite deployment to access backup files belonging to another site when backups are stored locally. In affected configurations, an admin on Site A could potentially retrieve sensitive backup data from Site B (same host, multisite) by crafting a backup download request with a traversal payload. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.",
    "published": "2026-06-12T20:25:33.729Z",
    "modified": "2026-06-12T20:25:33.729Z",
    "type": "cve",
    "title": "Discourse: Cross-site backup access via path traversal in multisite local backups",
    "source": "GitHub_M",
    "references": "https://github.com/discourse/discourse/security/advisories/GHSA-5j6v-4x6g-9pg5",
    "id": "CVE-2026-45775",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "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": 6.8,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N",
        "version": "3.1"
    },
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "discourse",
    "version": ">= 2026.1.0-latest, < 2026.1.4",
    "vendor": "discourse",
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    "ai_score": 0
}