GHSA-5gmf-3c43-q73v is a medium-severity (CVSS 6.1) vulnerability in zendframework/zendframework. A fix is available for zendframework/zendframework — see the affected versions and patch details below.
ZendFramework vulnerable to Cross-site Scripting
Real-World Exposure
zendframework/zendframeworkReal-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
Zend\Debug, Zend\Feed\PubSubHubbub, Zend\Log\Formatter\Xml, Zend\Tag\Cloud\Decorator, Zend\Uri, Zend\View\Helper\HeadStyle, Zend\View\Helper\Navigation\Sitemap, and Zend\View\Helper\Placeholder\Container\AbstractStandalone were not using Zend\Escaper when escaping HTML, HTML attributes, and/or URLs. While most were performing some escaping, because they were not using context-appropriate escaping mechanisms, they could potentially be exploited to perform Cross Site Scripting (XSS) attacks.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | zendframework/zendframework | ≥ 2.0.0&&< 2.0.1 | 2.0.1composer require zendframework/zendframework:^2.0.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for zendframework/zendframework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update zendframework/zendframework to 2.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5gmf-3c43-q73v 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-5gmf-3c43-q73v can be triaged on real exposure rather than presence alone.
Tailored to GHSA-5gmf-3c43-q73v. 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-5gmf-3c43-q73v in your dependencies?
O3 Security finds GHSA-5gmf-3c43-q73v across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.