Is CVE-2026-121627 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121627?

CVE-2026-121627 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-121627

Description

buku 5.0 through 5.1.1 contains a stored cross-site scripting vulnerability in the bukuserver bookmark list that allows attackers to execute script via an unescaped bookmark URL in BookmarkModelView._list_entry(). Attackers can submit a URL containing a double quote and event handler through the unauthenticated /api/bookmarks endpoint to issue same-origin API requests with viewers' credentials.