CVE-2026-12257Network attack vector

Unauthenticated code execution via unsanitized API method

Published Jul 13, 2026 · Updated Jul 13, 2026

Code injection in Mura CMS before 10.0.712 allows remote attackers to execute arbitrary code through the default JSON API endpoint. The endpoint /index.cfm/_api/json/v1/default passes an unsanitized POST method parameter to the ColdFusion engine, enabling injected CFML expressions and malicious Java object instantiation. No authentication or user interaction is required, and successful exploitation grants code execution in the CMS server context.

CVSS severity9.3
Critical
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Mura CMS before 10.0.712 allows remote attackers to execute arbitrary code through the default JSON API endpoint. The endpoint /index.cfm/_api/json/v1/default passes an unsanitized POST method parameter to the ColdFusion engine, enabling injected CFML expressions and malicious Java object instantiation. No authentication or user interaction is required, and successful exploitation grants code execution in the CMS server context.

The record

CVE
CVE-2026-12257
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
Mura Software
Product
Mura CMS
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.712

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mura Software · Mura CMSversion=10.0.712

Published CVSS scores

9.3INCIBE-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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