{"id":"BIT-discourse-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 to before 2026.1.4, 2026.3.0 to before 2026.3.1, and 2026.4.0 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.","aliases":["CVE-2026-45775","GHSA-5j6v-4x6g-9pg5"],"modified":"2026-09-08T08:46:24.875834344Z","published":"2026-06-16T12:37:42.347Z","database_specific":{"cpes":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"],"severity":"Medium"},"references":[{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-5j6v-4x6g-9pg5"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45775"}],"affected":[{"package":{"name":"discourse","ecosystem":"Bitnami","purl":"pkg:bitnami/discourse"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2026.1.0"},{"fixed":"2026.1.4"},{"introduced":"2026.3.0"},{"fixed":"2026.3.1"},{"introduced":"2026.4.0"},{"fixed":"2026.4.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-45775.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"}]}],"schema_version":"1.9.0"}