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MEDIUM severity

invoiceninja is vulnerable to Cross-site ScriptingGHSA-xg6r-5gx4-qxjm

MEDIUMFix: invoiceninja/invoiceninja@1186eaa

GHSA-xg6r-5gx4-qxjm is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in hillelcoren/invoice-ninja. 1 public exploit reference exists, so weaponization risk is real. A fix is available for hillelcoren/invoice-ninja — see the affected versions and patch details below.

Also known asCVE-2021-3977
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs47th percentile — riskier than 47% of all scored CVEsHighest risk
0.00%0.36%0.73%1.09%0.2%0.6%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-xg6r-5gx4-qxjm by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 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
🐘hillelcoren/invoice-ninja

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

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisthillelcoren/invoice-ninjaall versions5.3.35composer require hillelcoren/invoice-ninja:^5.3.35

Affected Products

1 product · 2 configurations
Application
invoice ninjainvoiceninja
≥ 5.0 && < 5.3.33
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.

invoiceninja is vulnerable to Improper Neutralization of Input During We…

huntr.devNVDDec 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update hillelcoren/invoice-ninja to 5.3.35 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xg6r-5gx4-qxjm 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

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

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invoiceninja is vulnerable to Cross-site Scripting