# CVE-2026-12666

## Summary

- **CVE ID:** CVE-2026-12666
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)
- **CWE:** CWE-611
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 17, 2026

## Description

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 Products

- IBM — MQ (9.1.0.0)
- IBM — MQ (9.2.0.0)
- IBM — MQ (9.3.0.0)
- IBM — MQ (9.4.0.0)
- IBM — MQ (10.0.0.0)

## References

- [CNA](https://www.ibm.com/support/pages/node/7284939)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 18.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._