---
id: CVE-2026-121627
title: buku 5.0 through 5.1.1 Stored XSS via bukuserver Bookmark List URL
summary: >-
  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 …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: jarun
product: buku
affected:
  - buku >= 5.0 <= 5.1.1
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T17:13:53.952Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121627'
references:
  - url: 'https://github.com/jarun/buku/issues/911'
    label: 'GitHub Issue #911'
  - url: 'https://github.com/jarun/buku/blob/v5.1.1/bukuserver/views.py#L133'
  - url: 'https://github.com/jarun/buku'
  - url: >-
      https://www.vulncheck.com/advisories/buku-5.0-through-5.1.1-stored-xss-via-bukuserver-bookmark-list-url
    label: >-
      VulnCheck Advisory: buku 5.0 through 5.1.1 Stored XSS via bukuserver
      Bookmark List URL
tags:
  - cve.org
epss: 0.00194
epssPercentile: 0.09173
ingestedAt: '2026-11-05T20:33:06.308Z'
---

## Overview

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.

## Affected

- `buku >= 5.0 <= 5.1.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.