Vulnerability-Lookup

CVE-2026-12666 (GCVE-0-2026-12666)

Vulnerability from cvelistv5 – Published: 2026-09-15 17:08 – Updated: 2026-09-15 17:08

Title

IBM MQ Java messaging is vulnerable to XML external entity injection

Summary

IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.

Severity

8.1 (High)


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

CWE

CWE-611 - Improper Restriction of XML External Entity Reference

Assigner

ibm mitre root

References

1 reference

URL	Tags
https://www.ibm.com/support/pages/node/7284939	vendor-advisorypatch

Impacted products

1 product

Vendor	Product	Version	CPE status
IBM	MQ	Affected: 9.1.0.0 , ≤ 9.1.0.37 LTS (semver) Affected: 9.2.0.0 , ≤ 9.2.0.43 LTS (semver) Affected: 9.3.0.0 , ≤ 9.3.0.41 LTS (semver) Affected: 9.3.0.0 , ≤ 9.3.5.1 CD (semver) Affected: 9.4.0.0 , ≤ 9.4.0.25 LTS (semver) Affected: 9.4.0.0 , ≤ 9.4.5.1 CD (semver) Affected: 10.0.0.0 cpe:2.3:a:ibm:mq:9.1.0.0:::::::* cpe:2.3:a:ibm:mq:9.1.0.37:::::::* cpe:2.3:a:ibm:mq:9.2.0.0:::::::* cpe:2.3:a:ibm:mq:9.2.0.43:::::::* cpe:2.3:a:ibm:mq:9.3.0.0:::::::* cpe:2.3:a:ibm:mq:9.3.0.41:::::::* cpe:2.3:a:ibm:mq:9.3.5.1:::::::* cpe:2.3:a:ibm:mq:9.4.0.0:::::::* cpe:2.3:a:ibm:mq:9.4.0.25:::::::* cpe:2.3:a:ibm:mq:9.4.5.1:::::::* cpe:2.3:a:ibm:mq:10.0.0.0:::::::*

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:ibm:mq:9.1.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.1.0.37:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.2.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.2.0.43:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.3.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.3.0.41:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.3.5.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.4.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.4.0.25:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.4.5.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:10.0.0.0:*:*:*:*:*:*:*"
          ],
          "product": "MQ",
          "vendor": "IBM",
          "versions": [
            {
              "lessThanOrEqual": "9.1.0.37 LTS",
              "status": "affected",
              "version": "9.1.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.2.0.43 LTS",
              "status": "affected",
              "version": "9.2.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.3.0.41 LTS",
              "status": "affected",
              "version": "9.3.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.3.5.1 CD",
              "status": "affected",
              "version": "9.3.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.4.0.25 LTS",
              "status": "affected",
              "version": "9.4.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.4.5.1 CD",
              "status": "affected",
              "version": "9.4.0.0",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "10.0.0.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eIBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.\u003c/p\u003e"
            }
          ],
          "value": "IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-611",
              "description": "CWE-611 Improper Restriction of XML External Entity Reference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T17:08:05.180Z",
        "orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
        "shortName": "ibm"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://www.ibm.com/support/pages/node/7284939"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThis issue was addressed under Known Issue DT474364\u003c/p\u003e\u003cp\u003eIBM MQ version 9.1 LTS\u003c/p\u003e\u003cp\u003e\u003ca href=\"https://www.ibm.com/support/pages/downloading-ibm-mq-91-lts\" rel=\"noopener noreferrer nofollow\"\u003eApply cumulative security update 9.1.0.38\u003c/a\u003e\u003c/p\u003e\u003cp\u003eIBM MQ version 9.2 LTS\u003c/p\u003e\u003cp\u003e\u003ca href=\"https://www.ibm.com/support/pages/downloading-ibm-mq-92-lts\" rel=\"noopener noreferrer nofollow\"\u003eApply cumulative security update 9.2.0.44\u003c/a\u003e\u003c/p\u003e\u003cp\u003eIBM MQ version 9.3 LTS\u003c/p\u003e\u003cp\u003e\u003ca href=\"https://www.ibm.com/support/pages/downloading-ibm-mq-93-lts\" rel=\"noopener noreferrer nofollow\"\u003eApply cumulative security update 9.3.0.42\u003c/a\u003e\u003c/p\u003e\u003cp\u003eIBM MQ version 9.4 LTS\u003c/p\u003e\u003cp\u003e\u003ca href=\"https://www.ibm.com/support/pages/downloading-ibm-mq-94-lts\" rel=\"noopener noreferrer nofollow\"\u003eApply cumulative security update\u003c/a\u003e\u003ca href=\"https://www.ibm.com/support/pages/downloading-ibm-mq-94-lts\" rel=\"noopener noreferrer nofollow\"\u003e\u00a09.4.0.26\u003c/a\u003e\u003c/p\u003e\u003cp\u003eIBM MQ version 9.3 CD, 9.4 CD and 10.0.0.0\u003c/p\u003e\u003cp\u003e\u003ca href=\"https://www.ibm.com/support/pages/downloading-ibm-mq-100\" rel=\"noopener noreferrer nofollow\"\u003eUpgrade to IBM MQ version 10.0.0.5\u003c/a\u003e\u003c/p\u003e"
            }
          ],
          "value": "This issue was addressed under Known Issue DT474364\n\n\n\nIBM MQ version 9.1 LTS\n\n\n\n Apply cumulative security update 9.1.0.38 https://www.ibm.com/support/pages/downloading-ibm-mq-91-lts \n\n\n\nIBM MQ version 9.2 LTS\n\n\n\n Apply cumulative security update 9.2.0.44 https://www.ibm.com/support/pages/downloading-ibm-mq-92-lts \n\n\n\nIBM MQ version 9.3 LTS\n\n\n\n Apply cumulative security update 9.3.0.42 https://www.ibm.com/support/pages/downloading-ibm-mq-93-lts \n\n\n\nIBM MQ version 9.4 LTS\n\n\n\n Apply cumulative security update https://www.ibm.com/support/pages/downloading-ibm-mq-94-lts  \u00a09.4.0.26 https://www.ibm.com/support/pages/downloading-ibm-mq-94-lts \n\n\n\nIBM MQ version 9.3 CD, 9.4 CD and 10.0.0.0\n\n\n\n Upgrade to IBM MQ version 10.0.0.5 https://www.ibm.com/support/pages/downloading-ibm-mq-100"
        }
      ],
      "title": "IBM MQ Java messaging is vulnerable to XML external entity injection"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
    "assignerShortName": "ibm",
    "cveId": "CVE-2026-12666",
    "datePublished": "2026-09-15T17:08:05.180Z",
    "dateReserved": "2026-06-18T19:13:47.535Z",
    "dateUpdated": "2026-09-15T17:08:05.180Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-12666",
      "date": "2026-09-16",
      "epss": "0.00264",
      "percentile": "0.18444"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-12666\",\"sourceIdentifier\":\"psirt@us.ibm.com\",\"published\":\"2026-09-15T18:17:14.290\",\"lastModified\":\"2026-09-16T19:22:22.797\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.\"}],\"affected\":[{\"source\":\"psirt@us.ibm.com\",\"affectedData\":[{\"vendor\":\"IBM\",\"product\":\"MQ\",\"cpes\":[\"cpe:2.3:a:ibm:mq:9.1.0.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.1.0.37:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.2.0.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.2.0.43:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.3.0.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.3.0.41:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.3.5.1:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.4.0.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.4.0.25:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:9.4.5.1:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:mq:10.0.0.0:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"9.1.0.0\",\"lessThanOrEqual\":\"9.1.0.37 LTS\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"9.2.0.0\",\"lessThanOrEqual\":\"9.2.0.43 LTS\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"9.3.0.0\",\"lessThanOrEqual\":\"9.3.0.41 LTS\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"9.3.0.0\",\"lessThanOrEqual\":\"9.3.5.1 CD\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"9.4.0.0\",\"lessThanOrEqual\":\"9.4.0.25 LTS\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"9.4.0.0\",\"lessThanOrEqual\":\"9.4.5.1 CD\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"10.0.0.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@us.ibm.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"psirt@us.ibm.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-611\"}]}],\"references\":[{\"url\":\"https://www.ibm.com/support/pages/node/7284939\",\"source\":\"psirt@us.ibm.com\"}]}}"
  }
}

FKIE_CVE-2026-12666

Vulnerability from fkie_nvd - Published: 2026-09-15 18:17 - Updated: 2026-09-16 19:22

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Summary

References

	URL	Tags
	psirt@us.ibm.com	https://www.ibm.com/support/pages/node/7284939

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:ibm:mq:9.1.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.1.0.37:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.2.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.2.0.43:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.3.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.3.0.41:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.3.5.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.4.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.4.0.25:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:9.4.5.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:mq:10.0.0.0:*:*:*:*:*:*:*"
          ],
          "product": "MQ",
          "vendor": "IBM",
          "versions": [
            {
              "lessThanOrEqual": "9.1.0.37 LTS",
              "status": "affected",
              "version": "9.1.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.2.0.43 LTS",
              "status": "affected",
              "version": "9.2.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.3.0.41 LTS",
              "status": "affected",
              "version": "9.3.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.3.5.1 CD",
              "status": "affected",
              "version": "9.3.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.4.0.25 LTS",
              "status": "affected",
              "version": "9.4.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.4.5.1 CD",
              "status": "affected",
              "version": "9.4.0.0",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "10.0.0.0"
            }
          ]
        }
      ],
      "source": "psirt@us.ibm.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing."
    }
  ],
  "id": "CVE-2026-12666",
  "lastModified": "2026-09-16T19:22:22.797",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "psirt@us.ibm.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-09-15T18:17:14.290",
  "references": [
    {
      "source": "psirt@us.ibm.com",
      "url": "https://www.ibm.com/support/pages/node/7284939"
    }
  ],
  "sourceIdentifier": "psirt@us.ibm.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-611"
        }
      ],
      "source": "psirt@us.ibm.com",
      "type": "Primary"
    }
  ]
}

GHSA-8MQ2-HM2C-3CCX

Vulnerability from github – Published: 2026-09-15 18:32 – Updated: 2026-09-15 18:32

Details

Severity

8.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-12666"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-15T18:17:14Z",
    "severity": "HIGH"
  },
  "details": "IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.",
  "id": "GHSA-8mq2-hm2c-3ccx",
  "modified": "2026-09-15T18:32:34Z",
  "published": "2026-09-15T18:32:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12666"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7284939"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-12666 (GCVE-0-2026-12666)

FKIE_CVE-2026-12666

GHSA-8MQ2-HM2C-3CCX

Tags

Sightings

Nomenclature

Related by attack behaviour