CVE-2026-104587: XSS

Q: Who is exposed to this issue?

Users of the local web interface are exposed when it renders a bookmark whose URL or DisplayURL contains a malicious payload. The payload executes in the browser context of the user viewing that bookmark.

Q: What does an attacker need to exploit the vulnerability?

The attacker needs to craft a malicious bookmark URL containing HTML attribute-breaking content and have that bookmark rendered in the local web interface. No additional exploitation prerequisites are described.

Published Oct 13, 2026

Updated

blob42 gosuki through commit 6e2bf34 contains a Stored Cross-Site Scripting (XSS) vulnerability. The application uses text/template instead of html/template, failing to perform context-aware auto-escaping on the URL and DisplayURL fields of bookmarks in internal/webui/templates/bookmarks.html. An attacker can craft a malicious bookmark URL containing HTML attribute-breaking payloads that execute arbitrary JavaScript in the victim's browser context when rendered in the local web interface.

Affected Software

1 affected component

blob42 gosuki<=6e2bf34

Event History

Oct 13, 2026

CVE Published

via MITRE·12:00 AM

Data Sourced

via MITRE·12:00 AM

Description

Frequently Asked Questions

Who is exposed to this issue?

Users of the local web interface are exposed when it renders a bookmark whose URL or DisplayURL contains a malicious payload. The payload executes in the browser context of the user viewing that bookmark.

What does an attacker need to exploit the vulnerability?

The attacker needs to craft a malicious bookmark URL containing HTML attribute-breaking content and have that bookmark rendered in the local web interface. No additional exploitation prerequisites are described.