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MEDIUM severity

CVE-2024-39123 — calibreweb

MEDIUM

CVE-2024-39123 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in calibreweb. EPSS puts its 30-day exploitation probability at 23.1% (98th percentile). The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Calibre-Web Cross Site Scripting (XSS)

Also known asGHSA-j22r-3rf3-cv25PYSEC-2026-1230
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-39123.

EPSS Exploitation Probability

via FIRST.org ↗
23.1%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
14.5%18.0%21.5%25.1%16.4%23.1%May 26Aug 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

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

In janeczku Calibre-Web 0.6.0 to 0.6.21, the edit_book_comments function is vulnerable to Cross Site Scripting (XSS) due to improper sanitization performed by the clean_string function. The vulnerability arises from the way the clean_string function handles HTML sanitization.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐍PyPIcalibreweb≥ 0.6.0No fix

Affected Products

1 product · 1 configurations
Application
calibre-webjaneczku
≥ 0.6.0 && ≤ 0.6.21
range

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. Remediation status

    The records we use list no patched version of calibreweb for CVE-2024-39123. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    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

In janeczku Calibre-Web 0.6.0 to 0.6.21, the edit_book_comments function is vulnerable to Cross Site Scripting (XSS) due to improper sanitization performed by the clean_string function. The vulnerability arises from the way the clean_string function handles HTML sanitization.
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CVE-2024-39123: calibreweb XSS (Medium 5.4)