CVE-2026-12257 Remote code execution in Mura Software’s CMS
Remote attackers can execute arbitrary code by injecting CFML expressions via the method parameter in Mura CMS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12257?
CVE-2026-12257 is a critical code injection vulnerability in Mura Software CMS, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Versions of Mura CMS prior to 10.0.712 contain a critical remote code execution (RCE) vulnerability. The flaw is located in the endpoint “/index.cfm/_api/json/v1/default”, where the “method” parameter in POST requests is not properly validated or sanitised before being processed by the ColdFusion engine. As a result, a remote attacker could exploit this vulnerability to inject and execute arbitrary CFML (ColdFusion Markup Language) expressions and instantiate malicious Java objects, thereby compromising the system’s security.
Weakness: CWE-94
Which versions are affected by CVE-2026-12257?
How do I fix CVE-2026-12257?
No fix has been published for CVE-2026-12257 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-12257 being exploited?
There is no known exploitation of CVE-2026-12257 in the wild and no public exploit code.
Sources
Also known as GHSA-h3q4-w5v4-67hw.