Summary
ZendFramework Potential Proxy Injection Vulnerabilities
Zend\Session\Validator\RemoteAddr and Zend\View\Helper\ServerUrl were found to be improperly parsing HTTP headers for proxy information, which could potentially allow an attacker to spoof a proxied IP or host name.
In Zend\Session\Validator\RemoteAddr, if the client is behind a proxy server, the detection of the proxy URL was incorrect, and could lead to invalid results on subsequent lookups.
In Zend\View\Helper\ServerUrl, if the server lives behind a proxy, the helper would always generate a URL based on the proxy host, regardless of whether or not this was desired; additionally, it did not take into account the proxy port or protocol, if provided.
Impact
GHSA-MG7H-9QFX-4R83 has a CVSS score of 5.9 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.0.5); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is GHSA-MG7H-9QFX-4R83? GHSA-MG7H-9QFX-4R83 is a medium-severity security vulnerability in zendframework/zendframework (composer), affecting versions >= 2.0.0, < 2.0.5. It is fixed in 2.0.5.
- How severe is GHSA-MG7H-9QFX-4R83? GHSA-MG7H-9QFX-4R83 has a CVSS score of 5.9 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of zendframework/zendframework are affected by GHSA-MG7H-9QFX-4R83? zendframework/zendframework (composer) versions >= 2.0.0, < 2.0.5 is affected.
- Is there a fix for GHSA-MG7H-9QFX-4R83? Yes. GHSA-MG7H-9QFX-4R83 is fixed in 2.0.5. Upgrade to this version or later.
- Is GHSA-MG7H-9QFX-4R83 exploitable, and should I be worried? Whether GHSA-MG7H-9QFX-4R83 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-MG7H-9QFX-4R83 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-MG7H-9QFX-4R83? Upgrade
zendframework/zendframeworkto 2.0.5 or later.