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CVE-2026-97359 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:10 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/wgetnz/hfs2/blob/master/advisories/hfs2-upload-filename-template-injection/README.md	[email protected]	AdvisoryExploitRemedyTechnical Analysis
https://www.vulncheck.com/advisories/hfs2-rce-via-multipart-upload-filename-template-injection	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1336	Improper Neutralization of Special Elements Used in a Template Engine	[email protected]

Affected Products

Product	Versions
Rejetto HTTP File Server	>= 2.4.0, <= 2.4.0 RC7 ~2.4
CPE cpe:2.3:a:rejetto:http_file_server:::::::: Remediation Workaround:low effort Do not expose HFS 2.x to untrusted networks; restrict listening to trusted internal networks or VPNs. Workaround:low effort Filter the multipart `filename` parameter for `%`, `{`, `}`, and `\|` at the reverse proxy layer. Workaround:low effort Run HFS with a restricted account that does not have command execution capabilities. Workaround:low effort Disable anonymous write permissions for all virtual directories if upload functionality is not required. Note that this only mitigates the issue, as the injection occurs during the upload rejection response rendering.

Product

Versions

Rejetto HTTP File Server

>= 2.4.0, <= 2.4.0 RC7

~2.4

CPE

cpe:2.3:a:rejetto:http_file_server:*:*:*:*:*:*:*:*

Remediation

Workaround:low effort
Do not expose HFS 2.x to untrusted networks; restrict listening to trusted internal networks or VPNs.
Workaround:low effort
Filter the multipart `filename` parameter for `%`, `{`, `}`, and `|` at the reverse proxy layer.
Workaround:low effort
Run HFS with a restricted account that does not have command execution capabilities.
Workaround:low effort
Disable anonymous write permissions for all virtual directories if upload functionality is not required. Note that this only mitigates the issue, as the injection occurs during the upload rejection response rendering.

Change History

1 change record found show changes