Vulnerability in Rejetto Hfs2
CVE-2026-97359
HFS2 version 2.4.0 and earlier contains a template injection vulnerability in the multipart upload handler that allows unauthenticated attackers to achieve remote code execution by embedding malicious template syntax in a filename. Attackers can craft a filename containing a closing template quoting sequence followed by an exec macro, which bypasses the authorization check in the dispatcher to execute arbitrary commands on the underlying host system.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.055 (92.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.055 · change: +0.047
Affected products
Weakness classification (CWE)
References
- github.com/wgetnz/hfs2/blob/master/advisories/hfs2-upload-filename-template-inj… (technical-description, exploit)
- VulnCheck Advisory (third-party-advisory)
Frequently asked questions
- What is CVE-2026-97359?
- CVE-2026-97359 is a critical-severity vulnerability in Rejetto Hfs2, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 10.0/10. Published 2026-09-24.
- How severe is CVE-2026-97359?
- Critical severity. CVSS v3 base score is 10.0 out of 10.