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MEDIUM severity

calibre-web is vulnerable to Cross-site ScriptingGHSA-wrp6-9w7f-3wxg

MEDIUMFix: janeczku/calibre-web@7ad419d

GHSA-wrp6-9w7f-3wxg is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in calibreweb. 1 public exploit reference exists, so weaponization risk is real. A fix is available for calibreweb — see the affected versions and patch details below.

Also known asCVE-2021-4170PYSEC-2026-620
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 13, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs56th percentile — riskier than 56% of all scored CVEsHighest risk
0.00%0.44%0.87%1.31%0.3%0.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-wrp6-9w7f-3wxg by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍calibreweb

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIcalibreweball versions0.6.15pip install --upgrade 'calibreweb==0.6.15'

Affected Products

1 product · 1 configurations
Application
calibre-webjaneczku
< 0.6.15
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

calibre-web is vulnerable to Improper Neutralization of Input During Web…

huntr.devNVDJan 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for calibreweb, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update calibreweb to 0.6.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wrp6-9w7f-3wxg is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

calibre-web is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
O3 Security · Impact-Aware SCA

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calibre-web is vulnerable to Cross-site Scripting