CVE-2026-104587 Cross-site scripting in n/a
Stored XSS in gosuki allows attackers to execute arbitrary JavaScript in victims' browsers via malicious bookmark URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-104587?
CVE-2026-104587 is a medium-severity cross-site scripting vulnerability in n/a, published on 13 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-104587?
How do I fix CVE-2026-104587?
No fix has been published for CVE-2026-104587 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-104587 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104587 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-vfxj-r6f4-qcvw.