{"id":"CVE-2026-45775","summary":"Discourse: Cross-site backup access via path traversal in multisite local backups","details":"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.","aliases":["BIT-discourse-2026-45775","GHSA-5j6v-4x6g-9pg5"],"modified":"2026-07-15T01:49:13.513160289Z","published":"2026-06-12T20:25:33.729Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45775.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45775.json"},{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-5j6v-4x6g-9pg5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45775"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/discourse/discourse","events":[{"introduced":"322d3c0ac6a8f133b3f82875e9dbbe310f638c1b"},{"fixed":"ec5d54b3291729ec201615c64d954545000896b9"},{"introduced":"896e810e1b296478bba91559a8fc89a9926f11fe"},{"fixed":"211de17ca39dec7bcb6afebdc9c79cebdc0b4495"},{"introduced":"fdd750d960e603415db62242eca3c30d68e366db"},{"fixed":"6bb9b59d5d3f5d0c813187a102318e9e4ae49647"}],"database_specific":{"extracted_events":[{"introduced":"2026.1.0-latest"},{"fixed":"2026.1.4"},{"introduced":"2026.3.0-latest"},{"fixed":"2026.3.1"},{"introduced":"2026.4.0-latest"},{"fixed":"2026.4.1"}],"source":"AFFECTED_FIELD"}}],"versions":["2026.5.0","v2026.4.0","v2026.1.3","v2026.3.0","v2026.4.0-latest","v2026.1.2","v2026.3.0-latest.1","v2026.1.1","v2026.3.0-latest","v2026.1.0","stable","esr","v2026.1.0-latest"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45775.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"}]}