CVE-2026-55439: Halo-Dev Halo

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Halo is an open source website building tool. Prior to 2.24.3, a path traversal vulnerability in the backup download endpoint allows authenticated administrators to read arbitrary files from the server filesystem. The backup download endpoint (GET /apis/console.api.migration.halo.run/v1alpha1/backups/{name}/files/{filename}) in MigrationServiceImpl.download() resolves the backup filename via Path.resolve() without validating that the resolved path stays within the designated backups directory. Also, the Backup creation endpoint (POST /apis/migration.halo.run/v1alpha1/backups) does not sanitize the status fields during creation This vulnerability is fixed in 2.24.3.

Affected products

• Halo-Dev Halo: before 2.24.3 (fixed in 2.24.3)

Published 2026-06-25. Last modified 2026-06-25.