Medium severity · published Jun 25, 2026
CVE-2026-55439
Halo: Path Traversal in Backup Download Leads to Arbitrary File Read
5.5
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HA
halo · halo-dev
< 2.24.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55439
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55439
github.com
https://github.com/halo-dev/halo/issues/10064
github.com
https://github.com/halo-dev/halo/security/advisories/GHSA-h8wj-chr2-hf66
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