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GHSA-XW6M-6CGM-V7QM

Vulnerability from github – Published: 2026-06-30 21:31 – Updated: 2026-06-30 21:31

Details

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

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-13759"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-30T20:17:28Z",
    "severity": "HIGH"
  },
  "details": "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",
  "id": "GHSA-xw6m-6cgm-v7qm",
  "modified": "2026-06-30T21:31:44Z",
  "published": "2026-06-30T21:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13759"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7278595"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-13759 (GCVE-0-2026-13759)

Vulnerability from cvelistv5 – Published: 2026-06-30 19:24 – Updated: 2026-06-30 19:24

Title

IBM WebSphere eXtreme Scale is affected by Insecure Deserilization

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

ibm

References

1 reference

URL	Tags
https://www.ibm.com/support/pages/node/7278595	vendor-advisorypatch

Impacted products

1 product

Vendor	Product	Version
IBM	WebSphere Extreme Scale	Affected: 8.6.1.0 , ≤ 8.6.1.6 (semver) cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.0:::::::* cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.6:::::::*

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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:*:*:*:*:*:*:*"
          ],
          "product": "WebSphere Extreme Scale",
          "vendor": "IBM",
          "versions": [
            {
              "lessThanOrEqual": "8.6.1.6",
              "status": "affected",
              "version": "8.6.1.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eIBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including RemoteConstructor.readResolve and PriorityQueue/ExtractorComparator are confirmed working, allowing a post-login attacker who can write a session attribute or a LAN-adjacent attacker on the grid replication wire to execute arbitrary code on peer WAS JVMs\u003c/p\u003e"
            }
          ],
          "value": "IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$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"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502 Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-30T19:24:03.665Z",
        "orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
        "shortName": "ibm"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://www.ibm.com/support/pages/node/7278595"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eWe recommend customer to enable encryption. Please follow the link to enable encryption.\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/docs/en/wxs/latest?topic=sydgies-securing-data-that-flows-between-extreme-scale-clients-servers-ssl-encryption.\" rel=\"nofollow\"\u003ehttps://www.ibm.com/docs/en/wxs/latest?topic=sydgies-securing-data-that-flows-between-extreme-scale-clients-servers-ssl-encryption.\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eFor 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.\u003c/p\u003e"
            }
          ],
          "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."
        }
      ],
      "title": "IBM WebSphere eXtreme Scale is affected by Insecure Deserilization",
      "x_generator": {
        "engine": "ibm-cvegen"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
    "assignerShortName": "ibm",
    "cveId": "CVE-2026-13759",
    "datePublished": "2026-06-30T19:24:03.665Z",
    "dateReserved": "2026-06-29T18:10:36.156Z",
    "dateUpdated": "2026-06-30T19:24:03.665Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-XW6M-6CGM-V7QM

CVE-2026-13759 (GCVE-0-2026-13759)

Tags

Sightings

Nomenclature