Threats affecting pkg:maven/io.vertx/vertx-web

In Eclipse Vert.x versions [4.0.0,4.5.35] or [5.0.0,5.2.2], when one `CachingWebClient` is shared across users — the documented pattern of a per-user `WebClientSession` over a shared caching client — a response that is specific to one user but is cacheable and not marked `private`/`no-store` is stored in the client-level shared cache tier and served to other users requesting the same URL. A later user's session, or an anonymous caller through the same client, can receive an earlier user's response. Depending on the response this discloses authenticated content or a session cookie, the latter enabling session fixation or hijacking.

Eclipse Vert.x versions 4.0.0 through 4.5.34, 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, and 5.2.0 contain a scope bypass vulnerability in the ChainAuthHandler component of Eclipse Vert.x Web. This vulnerability occurs when ChainAuthHandler is used with scope-requiring authentication handlers such as JWTAuthHandler or OAuth2AuthHandler. If a user is already authenticated by a preceding handler, ChainAuthHandler skips scope validation, allowing access to resources without proper scope checks.