IBM MQ is widely used enterprise messaging middleware; an XXE allowing data theft or DoS can disrupt business-critical integrations.
CVE-2026-13271
Authenticated XXE in IBM MQ allows data exfiltration or denial of service.
Is CVE-2026-13271 being exploited?
Not confirmed. CVE-2026-13271 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-13271?
CVE-2026-13271 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-13271?
Yes. A fix has been recorded for CVE-2026-13271. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-13271 affect?
CVE-2026-13271 affects IBM MQ 9.2.0.0 - 9.2.0.44 LTS, IBM MQ 9.3.0.0 - 9.3.0.42 LTS, IBM MQ 9.4.0.0 - 9.4.0.26 LTS, IBM MQ 9.4.0.0 - 9.4.5.1 CD, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-13271?
Apply IBM PSIRT fixes immediately; disable XXE parsing and restrict admin access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can exploit XML external entities in command queue processing to read sensitive files or cause service DoS.
Patch when possible
- affected>= 9.2.0.0 and <= 9.2.0.44
- affected>= 9.3.0.0 and <= 9.3.0.42
- affected>= 9.4.0.0 and <= 9.4.0.26
- affected>= 9.4.0.0 and <= 9.4.5.1
- affected>= 10.0.0.0 and <= 10.0.0.5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
timeline
- 4 Nov 2026Published
- 4 Nov 2026CVE record last updated · same day later
- 5 Nov 2026Analysed by vulneraibility.com · same day later
- Patchibm.com /support/pages/node/7294654
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.