GHSA-VVM3-RV48-J3G5

Zendframework Potential XSS or HTML Injection vector in Zend_Json

Zend_Json_Encoder was not taking into account the solidus character (/) during encoding, leading to incompatibilities with the JSON specification, and opening the potential for XSS or HTML injection attacks when returning HTML within a JSON string.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

GHSA-VVM3-RV48-J3G5 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. 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 (1.7.9, 1.8.5, 1.9.7); upgrading removes the vulnerable code path.

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1. What is GHSA-VVM3-RV48-J3G5? GHSA-VVM3-RV48-J3G5 is a medium-severity cross-site scripting (XSS) vulnerability in zendframework/zendframework1 (composer), affecting versions >= 1.7.0, < 1.7.9. It is fixed in 1.7.9, 1.8.5, 1.9.7. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. How severe is GHSA-VVM3-RV48-J3G5? GHSA-VVM3-RV48-J3G5 has a CVSS score of 6.1 (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.
3. Which versions of zendframework/zendframework1 are affected by GHSA-VVM3-RV48-J3G5? zendframework/zendframework1 (composer) versions >= 1.7.0, < 1.7.9 is affected.
4. Is there a fix for GHSA-VVM3-RV48-J3G5? Yes. GHSA-VVM3-RV48-J3G5 is fixed in 1.7.9, 1.8.5, 1.9.7. Upgrade to this version or later.
5. Is GHSA-VVM3-RV48-J3G5 exploitable, and should I be worried? Whether GHSA-VVM3-RV48-J3G5 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
6. What actually determines whether GHSA-VVM3-RV48-J3G5 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.
7. How do I fix GHSA-VVM3-RV48-J3G5?
   • Upgrade zendframework/zendframework1 to 1.7.9 or later
   • Upgrade zendframework/zendframework1 to 1.8.5 or later
   • Upgrade zendframework/zendframework1 to 1.9.7 or later

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