CVE-2026-12667 IBM MQ .NET client is vulnerable to XML external entity injection
An authenticated attacker can exploit XML external entity injection in the IBM MQ .NET client to read local files or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12667?
CVE-2026-12667 is a high-severity vulnerability in IBM MQ, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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 could allow an authenticated attacker to read files from a vulnerable .NET client or cause limited denial of service due to improper handling of XML external entities in RFH2 folder parsing.
Weakness: CWE-611
Which versions are affected by CVE-2026-12667?
How do I fix CVE-2026-12667?
No fix has been published for CVE-2026-12667 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-12667 being exploited?
There is no known exploitation of CVE-2026-12667 in the wild and no public exploit code.
Sources
Also known as GHSA-xgj9-c375-55gp.