IBMCVE-2026-12666
IBM MQ: information disclosure
High8.1CVE-2026-12666 · Published Sep 15, 2026 · updated Sep 17, 2026
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| MQ Product | >= 9.1.0.0, <= 9.1.0.37 LTS | No fix yet |
| >= 9.2.0.0, <= 9.2.0.43 LTS | No fix yet | |
| >= 9.3.0.0, <= 9.3.0.41 LTS | No fix yet | |
| >= 9.3.0.0, <= 9.3.5.1 CD | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-611
More IBM advisories
All IBM| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 15 | IBM Cloud Pak for Business Automation: cross-site scripting | Medium5.4 | No fix yet |
| Sep 15 | IBM Business Automation Workflow containers and traditional: XML external entity | High7.1 | No fix yet |
| Sep 15 | IBM Security Verify Access: denial of service | High7.5 | No fix yet |
| Sep 15 | IBM MQ: denial of service | High7.1 | No fix yet |
| Sep 15 | IBM MQ: code execution | High8.8 | No fix yet |
| Sep 15 | IBM Business Automation Workflow: missing authorization | Medium5.4 | No fix yet |