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.
{
"cwe_ids": [
"CWE-22"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45775.json",
"cna_assigner": "GitHub_M"
}{
"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"
}