{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-13759", "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "state": "PUBLISHED", "assignerShortName": "ibm", "dateReserved": "2026-06-29T18:10:36.156Z", "datePublished": "2026-06-30T19:24:03.665Z", "dateUpdated": "2026-07-03T03:56:10.967Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "shortName": "ibm", "dateUpdated": "2026-06-30T19:24:03.665Z"}, "title": "IBM WebSphere eXtreme Scale is affected by Insecure Deserilization", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data", "type": "CWE"}]}], "affected": [{"vendor": "IBM", "product": "WebSphere Extreme Scale", "versions": [{"status": "affected", "version": "8.6.1.0", "lessThanOrEqual": "8.6.1.6", "versionType": "semver"}], "cpes": ["cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.6:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including RemoteConstructor.readResolve and PriorityQueue/ExtractorComparator are confirmed working, allowing a post-login attacker who can write a session attribute or a LAN-adjacent attacker on the grid replication wire to execute arbitrary code on peer WAS JVMs", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including RemoteConstructor.readResolve and PriorityQueue/ExtractorComparator are confirmed working, allowing a post-login attacker who can write a session attribute or a LAN-adjacent attacker on the grid replication wire to execute arbitrary code on peer WAS JVMs</p>"}]}], "references": [{"url": "https://www.ibm.com/support/pages/node/7278595", "tags": ["vendor-advisory", "patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}}], "solutions": [{"lang": "en", "value": "We recommend customer to enable encryption. Please follow the link to enable encryption.\n https://www.ibm.com/docs/en/wxs/latest?topic=sydgies-securing-data-that-flows-between-extreme-scale-clients-servers-ssl-encryption. \n\nFor extra security customer can enable JEP 290 global JVM deserialization filter (-Djdk.serialFilter) while starting catalog and container servers.JEP 290 is available from 8.0.8.5 onwards.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>We recommend customer to enable encryption. Please follow the link to enable encryption.<br/><a href=\"https://www.ibm.com/docs/en/wxs/latest?topic=sydgies-securing-data-that-flows-between-extreme-scale-clients-servers-ssl-encryption.\" rel=\"nofollow\">https://www.ibm.com/docs/en/wxs/latest?topic=sydgies-securing-data-that-flows-between-extreme-scale-clients-servers-ssl-encryption.</a><br/><br/>For extra security customer can enable JEP 290 global JVM deserialization filter (-Djdk.serialFilter) while starting catalog and container servers.JEP 290 is available from 8.0.8.5 onwards.</p>"}]}], "x_generator": {"engine": "ibm-cvegen"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-02T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-13759"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-03T03:56:10.967Z"}}]}}

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