{"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": "2026-11-03T14:55:48.515Z"}, "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\u00a0`CachingWebClient`\u00a0is shared across users \u2014 the documented pattern of a per-user\u00a0`WebClientSession`\u00a0over a shared caching client \u2014 a response that is specific to one user but is cacheable and not marked\u00a0`private`/`no-store`\u00a0is 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 \u2014 the documented pattern of a per-user&nbsp;`WebClientSession`&nbsp;over a shared caching client \u2014 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"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Eclipse Vert.x", "vendor": "Eclipse Foundation", "versions": [{"lessThanOrEqual": "4.5.35", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThanOrEqual": "5.2.2", "status": "affected", "version": "5.0.0", "versionType": "semver"}]}], "source": "emo@eclipse.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Eclipse Vert.x versions [4.0.0,4.5.35] or [5.0.0,5.2.2], when one\u00a0`CachingWebClient`\u00a0is shared across users \u2014 the documented pattern of a per-user\u00a0`WebClientSession`\u00a0over a shared caching client \u2014 a response that is specific to one user but is cacheable and not marked\u00a0`private`/`no-store`\u00a0is 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."}], "id": "CVE-2026-118489", "lastModified": "2026-11-03T16:13:23.003", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "emo@eclipse.org", "type": "Secondary"}]}, "published": "2026-11-03T15:17:24.780", "references": [{"source": "emo@eclipse.org", "url": "https://github.com/vert-x3/vertx-web/security/advisories/GHSA-xh2g-9hw9-mvp3"}, {"source": "emo@eclipse.org", "url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/523"}], "sourceIdentifier": "emo@eclipse.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}, {"lang": "en", "value": "CWE-524"}], "source": "emo@eclipse.org", "type": "Primary"}]}

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