patrickhener goshs up to 2.0.1 httpserver/updown.go cross-site request forgery

Summaryinfo

A vulnerability identified as problematic has been detected in patrickhener goshs up to 2.0.1. Impacted is an unknown function of the file httpserver/updown.go. This manipulation causes cross-site request forgery. The identification of this vulnerability is CVE-2026-42091. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in patrickhener goshs up to 2.0.1. It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the file httpserver/updown.go. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. The CWE definition for the vulnerability is CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. As an impact it is known to affect integrity. The summary by CVE is:

goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the CVE-2026-40883 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser — bypassing network isolation (e.g. localhost, internal network). This issue has been patched in version 2.0.2.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-42091 since 04/23/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 2.0.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 0e715b94e10c3d1aa552276000f15f104dee2f32 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• patrickhener

Name

• goshs

Version

• 2.0.0
• 2.0.1

License

• open-source

Website

• Product: https://github.com/patrickhener/goshs/

CPE 2.3info

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CPE 2.2info

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