CVE-2026-12666IBM MQ Java messaging is vulnerable to XML external entity injection
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- CWE-611
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- ibm
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
IBM MQ ibm:mq | from 9.1.0.0 through 9.1.0.37 LTS; from 9.2.0.0 through 9.2.0.43 LTS; from 9.3.0.0 through 9.3.0.41 LTS; from 9.3.0.0 through 9.3.5.1 CD; from 9.4.0.0 through 9.4.0.25 LTS; from 9.4.0.0 through 9.4.5.1 CD; 10.0.0.0 | CNA record |
References
- https://www.ibm.com/support/pages/node/7284939vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.