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MEDIUM severity

Cross-site scripting in application/controllers/dropbox.php in JustWritingGHSA-gxmc-5wj3-jx64

MEDIUM

GHSA-gxmc-5wj3-jx64 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in hjue/justwriting. No vendor fix is recorded yet; mitigation options are listed below.

Also known asCVE-2021-41467
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.6%probability of exploitation in next 30 days
Lower Risk+0.06%
Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk
2.33%4.49%6.66%8.83%7.6%3.5%3.6%May 26Jul 26Oct 26

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

How urgent is this, really

GHSA-gxmc-5wj3-jx64 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
🐘hjue/justwriting

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

Description

Cross-site scripting (XSS) vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐘Packagisthjue/justwritingall versionsNo fix

Affected Products

1 product · 1 configurations
Application
justwritingjustwriting_project
1 version
1.0.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    No patched version of hjue/justwriting has shipped for GHSA-gxmc-5wj3-jx64 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  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.

How to detect GHSA-gxmc-5wj3-jx64

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id ghsa-gxmc-5wj3-jx64 -u https://target
Template
JustWriting - Cross-Site Scripting
Severity
medium
Impact
Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to session hijacking, defacement, or theft of sensitive information.
Remediation
Upgrade to the latest version to mitigate this vulnerability.

Template by ProjectDiscovery nuclei-templates (madrobot), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

Cross-site scripting (XSS) vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.
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Cross-site scripting in application/controllers/dropbox.php…