GMS-2021-65: Directory traversal in development mode handler in Vaadin 14 and 15-17

April 19, 2021 (updated October 8, 2021)

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

References

github.com/advisories/GHSA-82mf-mmh7-hxp5
github.com/vaadin/platform/security/advisories/GHSA-82mf-mmh7-hxp5
vaadin.com/security/cve-2020-36321

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