Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M

CVE-2026-55439Halo: Path Traversal in Backup Download Leads to Arbitrary File Read

Medium 5.5

In plain English

A medium-severity path traversal in halo from halo-dev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.4%top 64.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
halo-dev	halo	< 2.24.3

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L

References

https://github.com/halo-dev/halo/security/advisories/GHSA-h8wj-chr2-hf66 x_refsource_CONFIRM
https://github.com/halo-dev/halo/issues/10064 x_refsource_MISC