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Java CVE-2026-12257

| EUVDEUVD-2026-43487 CRITICAL
Cross-site Scripting (XSS) (CWE-79)
2026-07-13 INCIBE
XSS RCE Java Cms
9.3
CVSS 4.0 · Vendor: INCIBE
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Severity by source

Vendor (INCIBE) PRIMARY
9.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.8 CRITICAL

Unauthenticated network POST to an exposed API endpoint (AV:N/AC:L/PR:N/UI:N) yields CFML/Java code execution with full host compromise, so C/I/A all High.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (INCIBE).

CVSS VectorVendor: INCIBE

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

6
Analysis Updated
Jul 13, 2026 - 14:29 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 13, 2026 - 14:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 13, 2026 - 14:22 vuln.today
cvss_changed
Severity Changed
Jul 13, 2026 - 14:22 NVD
MEDIUM CRITICAL
CVSS changed
Jul 13, 2026 - 14:22 NVD
5.1 (MEDIUM) 9.3 (CRITICAL)
Analysis Generated
Jul 13, 2026 - 12:31 vuln.today

DescriptionCVE.org

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.

Articles & Coverage 2

News 3 New Java Vulnerabilities - 1 Critical, 2 High, 1 With POC Jul 14, 2026 News Critical RCE in Mura CMS (Java/CFML) - CVE-2026-12257 Jul 13, 2026

AnalysisAI

Remote code execution in Mura CMS versions prior to 10.0.712 allows unauthenticated attackers to execute arbitrary CFML and instantiate malicious Java objects by abusing the unvalidated 'method' parameter in POST requests to the /index.cfm/_api/json/v1/default JSON API endpoint. Because the ColdFusion engine processes the attacker-controlled input without sanitisation, a single crafted request yields full compromise (VC:H/VI:H/VA:H). …

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Recommended ActionAI

Within 24 hours: Conduct a complete inventory of Mura CMS installations in the organization and identify all instances running versions before 10.0.712; immediately separate vulnerable systems from production networks if an upgrade timeline cannot be confirmed. …

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CVE-2026-12257 vulnerability details – vuln.today
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