GHSA-x6vr-q3vf-vqgq is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in redaxo/source. A fix is available for redaxo/source — see the affected versions and patch details below.
REDAXO CMS is vulnerable to Reflected XSS in Mediapool Info Banner via args[types]
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 GHSA-x6vr-q3vf-vqgq.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-x6vr-q3vf-vqgq plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 376,715 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
redaxo/sourceReal-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
Summary
A reflected Cross-Site Scripting (XSS) vulnerability exists in the Mediapool view where the request parameter args[types] is rendered into an info banner without HTML-escaping. This allows arbitrary JavaScript execution in the backend context when an authenticated user visits a crafted link while logged in.
Details
Control Flow:
redaxo/src/addons/mediapool/pages/index.phpreads args viarex_request('args', 'array')and passes them through as$argUrltomedia.list.php.redaxo/src/addons/mediapool/pages/media.list.phpinjects$argUrl['args']['types']into an HTML string without escaping:
if (!empty($argUrl['args']['types'])) {
echo rex_view::info(rex_i18n::msg('pool_file_filter') . ' <code>' . $argUrl['args']['types'] . '</code>');
}
PoC
- Log into the REDAXO backend.
- While authenticated, open a crafted URL like:
<host>/index.php?page=mediapool/media&args[types]="><img+src%3Dx+onerror%3Dalert%28document.domain%29> - The info banner displays the unescaped value and activates the injected onerror handler, which opens an alert pop-up.
Impact
Arbitrary JavaScript execution in the backend, enabling theft of session cookies, CSRF tokens, or other sensitive data, and allowing an attacker to perform any administrative actions on behalf of the affected user.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | redaxo/source | all versions | 5.20.1composer require redaxo/source:^5.20.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for redaxo/source, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update redaxo/source to 5.20.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-x6vr-q3vf-vqgq is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-x6vr-q3vf-vqgq can be triaged on real exposure rather than presence alone.
Tailored to GHSA-x6vr-q3vf-vqgq. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-x6vr-q3vf-vqgq in your dependencies?
O3 Security finds GHSA-x6vr-q3vf-vqgq across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.