{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118489","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","state":"PUBLISHED","assignerShortName":"eclipse","dateReserved":"2026-10-28T11:32:56.782Z","datePublished":"2026-11-03T14:55:48.515Z","dateUpdated":"2026-11-03T18:09:32.017Z"},"containers":{"cna":{"providerMetadata":{"orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","shortName":"eclipse","dateUpdated":"2026-11-03T14:55:48.515Z"},"title":"CachingWebClient shares user-specific HTTP responses across users via the shared cache tier","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-200","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","type":"CWE"}]},{"descriptions":[{"lang":"en","cweId":"CWE-524","description":"CWE-524 Use of Cache Containing Sensitive Information","type":"CWE"}]}],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Vert.x","versions":[{"status":"affected","version":"4.0.0","lessThanOrEqual":"4.5.35","versionType":"semver"},{"status":"affected","version":"5.0.0","lessThanOrEqual":"5.2.2","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>In Eclipse Vert.x versions [4.0.0,4.5.35] or [5.0.0,5.2.2], when one&nbsp;`CachingWebClient`&nbsp;is shared across users — the documented pattern of a per-user&nbsp;`WebClientSession`&nbsp;over a shared caching client — a response that is specific to one user but is cacheable and not marked&nbsp;`private`/`no-store`&nbsp;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.</p>"}]}],"references":[{"url":"https://github.com/vert-x3/vertx-web/security/advisories/GHSA-xh2g-9hw9-mvp3"},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/523"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}}],"credits":[{"lang":"en","value":"Taehoon Ha","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-11-03T18:09:07.920897Z","id":"CVE-2026-118489","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-11-03T18:09:32.017Z"}}]}}