GHSA-82MF-MMH7-HXP5

Directory traversal in development mode handler in Vaadin 14 and 15-17

Improper URL validation in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.4.1 (Vaadin 14.0.0 through 14.4.2), and 3.0 prior to 5.0 (Vaadin 15 prior to 18) allows attacker to request arbitrary files stored outside of intended frontend resources folder.

• https://vaadin.com/security/cve-2020-36321

The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.

GHSA-82MF-MMH7-HXP5 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 (14.4.3, 18.0.0); upgrading removes the vulnerable code path.

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1. What is GHSA-82MF-MMH7-HXP5? GHSA-82MF-MMH7-HXP5 is a medium-severity improper input validation vulnerability in com.vaadin:vaadin-bom (maven), affecting versions >= 14.0.0, < 14.4.3. It is fixed in 14.4.3, 18.0.0. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
2. How severe is GHSA-82MF-MMH7-HXP5? GHSA-82MF-MMH7-HXP5 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.
3. Which versions of com.vaadin:vaadin-bom are affected by GHSA-82MF-MMH7-HXP5? com.vaadin:vaadin-bom (maven) versions >= 14.0.0, < 14.4.3 is affected.
4. Is there a fix for GHSA-82MF-MMH7-HXP5? Yes. GHSA-82MF-MMH7-HXP5 is fixed in 14.4.3, 18.0.0. Upgrade to this version or later.
5. Is GHSA-82MF-MMH7-HXP5 exploitable, and should I be worried? Whether GHSA-82MF-MMH7-HXP5 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-82MF-MMH7-HXP5 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-82MF-MMH7-HXP5?
   • Upgrade com.vaadin:vaadin-bom to 14.4.3 or later
   • Upgrade com.vaadin:vaadin-bom to 18.0.0 or later

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