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.
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Fixes

Solution

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Workaround

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History

Tue, 03 Nov 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 03 Nov 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse vert.x
Eclipse Foundation
Eclipse Foundation vert.x
Vendors & Products Eclipse
Eclipse vert.x
Eclipse Foundation
Eclipse Foundation vert.x

Tue, 03 Nov 2026 15:00:00 +0000

Type Values Removed Values Added
Description 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.
Title CachingWebClient shares user-specific HTTP responses across users via the shared cache tier
Weaknesses CWE-200
CWE-524
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published:

Updated: 2026-11-03T18:09:32.017Z

Reserved: 2026-10-28T11:32:56.782Z

Link: CVE-2026-118489

cve-icon Vulnrichment

Updated: 2026-11-03T18:09:23.103Z

cve-icon NVD

Status : Deferred

Published: 2026-11-03T15:17:24.780

Modified: 2026-11-03T19:17:55.877

Link: CVE-2026-118489

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-03T17:00:16Z

Weaknesses