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MEDIUM severity

Cross-Site Scripting in gravGHSA-5jxc-hmqf-3f73

MEDIUMFix: getgrav/grav@afc69a3

GHSA-5jxc-hmqf-3f73 is a medium-severity (CVSS 6.3) Cross-site Scripting (XSS) vulnerability in getgrav/grav. 1 public exploit reference exists, so weaponization risk is real. A fix is available for getgrav/grav — see the affected versions and patch details below.

Also known asCVE-2021-3904
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%0.3%0.6%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-5jxc-hmqf-3f73 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
🐘getgrav/grav

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

grav prior to version 1.7.24 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistgetgrav/gravall versions1.7.24composer require getgrav/grav:^1.7.24

Affected Products

1 product · 1 configurations
Application
gravgetgrav
< 1.7.24
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.

grav is vulnerable to Improper Neutralization of Input During Web Page G…

huntr.devNVDOct 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 getgrav/grav, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update getgrav/grav to 1.7.24 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5jxc-hmqf-3f73 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

grav prior to version 1.7.24 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
O3 Security · Impact-Aware SCA

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Cross-Site Scripting in grav (Medium 6.3)