Cloudanix VulnDB

CVE-2026-118489

High · 7.5

CVSS

7.5

EPSS

0.3%

Published

Nov 3, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed

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