CVE-2026-55439: Halo: Path Traversal in Backup Download Leads to Arbitrary File Read
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Haloto a version that resolves this vulnerability.Fixed in 2.24.3
Event History
Frequently Asked Questions
What is the severity of CVE-2026-55439?
The severity of CVE-2026-55439 is classified as medium with a score of 5.5.
What vulnerability does CVE-2026-55439 describe?
CVE-2026-55439 describes a path traversal vulnerability in Halo that allows authenticated administrators to read arbitrary files from the server filesystem.
How do I fix CVE-2026-55439?
To fix CVE-2026-55439, upgrade Halo to version 2.24.3 or later where the vulnerability has been addressed.
Who is affected by CVE-2026-55439?
Authenticated administrators of Halo versions prior to 2.24.3 are affected by CVE-2026-55439.
What can an attacker do with CVE-2026-55439?
An attacker with administrative access can exploit CVE-2026-55439 to read arbitrary files from the server filesystem.