halo-dev halo up to 2.24.2 Backup Download Endpoint /apis/console.api MigrationServiceImpl.download path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in halo-dev halo up to 2.24.2. Affected is the function MigrationServiceImpl.download of the file /apis/console.api of the component Backup Download Endpoint. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-55439. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in halo-dev halo up to 2.24.2 and classified as critical. This issue affects the function MigrationServiceImpl.download of the file /apis/console.api of the component Backup Download Endpoint. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-55439 since 06/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.24.3 eliminates this vulnerability.

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Productinfo

Vendor

• halo-dev

Name

• halo

Version

• 2.24.0
• 2.24.1
• 2.24.2

Website

• Product: https://github.com/halo-dev/halo/

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CPE 2.2info

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