---
id: CVE-2021-4170
aliases:
  - GHSA-wrp6-9w7f-3wxg
  - PYSEC-2026-620
title: calibre-web is vulnerable to Cross-site Scripting
summary: calibre-web is vulnerable to Cross-site Scripting
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
vendor: calibreweb
product: calibreweb
ecosystem: pip
affected:
  - calibreweb < 0.6.15
patched:
  - calibreweb 0.6.15
published: '2022-01-21'
updated: '2026-07-06'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-wrp6-9w7f-3wxg'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-4170'
  - url: >-
      https://github.com/janeczku/calibre-web/commit/7ad419dc8c12180e842a82118f4866ac3d074bc5
  - url: 'https://github.com/janeczku/calibre-web'
  - url: 'https://huntr.dev/bounties/ff395101-e392-401d-ab4f-579c63fbf6a0'
tags:
  - osv
  - pip
epss: 0.00809
epssPercentile: 0.55404
ingestedAt: '2026-07-08T18:25:53.901Z'
---

## Overview

calibre-web is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

## Affected packages

- `calibreweb < 0.6.15`

## Remediation

Upgrade to a patched release:

- `calibreweb 0.6.15`