CVE-2026-118489 Details
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.
A vulnerability exists in Eclipse Vert.x versions 4.0.0 prior to 4.5.36 and 5.0.0 prior to 5.2.3, where a shared 'CachingWebClient' can inadvertently expose user-specific HTTP responses to other users. This occurs when the 'WebClientSession' is shared over a caching client, and a response that is cacheable but not marked as 'private' or 'no-store' is stored in the client-level shared cache. As a result, a later user's session, or an anonymous caller, may receive an earlier user's response. This flaw can lead to the unintentional disclosure of authenticated content or a session cookie, the latter potentially allowing for session fixation or hijacking.
Users can upgrade to Eclipse Vert.x versions 4.5.36 or 5.2.3 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 3, 2026CISA-ADP
Assessed Nov 3, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/vert-x3/vertx-web/security/advisories/GHSA-xh2g-9hw9-mvp3 | [email protected] | AdvisoryRemedyVendor |
| https://gitlab.eclipse.org/security/cve-assignment/-/work_items/523 | [email protected] | Issue TrackingVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | [email protected] |
| CWE-524 | Use of Cache Containing Sensitive Information | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Eclipse Vert.x | >= 4.0.0, <= 4.5.35 (semver) >= 5.0.0, <= 5.2.2 (semver) |
CPE
Remediation
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| Eclipse Vert.x Web Client | >= 4.0.0, <= 4.5.35 (semver) >= 5.0.0, <= 5.2.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 3, 2026 | CVE Modified | CISA-ADP |
| Nov 3, 2026 | New CVE Received | [email protected] |