CVE-2026-48907 – Joomla JCE Unauthenticated Remote Code Execution (RCE)

Severity: Critical (CVSS 9.8 / CVSS v4 10.0)
CVE: CVE-2026-48907
CWE: CWE-284 – Improper Access Control
Affected Software: Joomla Content Editor (JCE) Extension for Joomla
Status: Publicly disclosed and actively exploited in the wild.

CVE-2026-48907 is a critical unauthenticated Remote Code Execution (RCE) vulnerability affecting the Joomla Content Editor (JCE) extension.

The vulnerability stems from improper access control within JCE's profile management functionality. An attacker can create malicious editor profiles without authentication, eventually enabling arbitrary PHP file upload and execution on the target server.

Successful exploitation allows complete compromise of the Joomla installation.

Vulnerability Details

Affected versions:

JCE 1.0.0
through
JCE 2.9.99.4

Patched beginning with:

2.9.99.5

Additional hardening was introduced in later releases.

Root Cause

The vulnerability exists because the JCE extension fails to properly enforce authorization checks on profile management functionality.

Expected Flow

Administrator
      │
      ▼
Create Editor Profile
      │
      ▼
Upload Content

Vulnerable Flow

Unauthenticated User
        │
        ▼
Create Editor Profile
        │
        ▼
Gain Upload Permissions
        │
        ▼
Upload PHP Payload
        │
        ▼
Execute PHP
        │
        ▼
Remote Code Execution

The missing authorization validation effectively allows anonymous users to influence security-sensitive configuration.

Impact

Successful exploitation may allow an attacker to:

• Execute arbitrary PHP code
• Obtain complete control of the Joomla website
• Install webshells
• Steal sensitive information
• Modify website content
• Deploy malware
• Install ransomware
• Pivot into internal infrastructure

Because exploitation requires no authentication, this vulnerability is considered extremely dangerous.

Attack Flow

Internet
    │
    ▼
Unauthenticated Request
    │
    ▼
Create Malicious JCE Profile
    │
    ▼
Profile Allows PHP Upload
    │
    ▼
Upload PHP File
    │
    ▼
Request Uploaded File
    │
    ▼
PHP Executes
    │
    ▼
Remote Code Execution

Interpretation

• Network exploitable
• No authentication required
• Low attack complexity
• No user interaction
• Complete confidentiality impact
• Complete integrity impact
• Complete availability impact

Indicators of Compromise (IOCs)

Administrators should investigate for:

• Unexpected JCE editor profiles
• Newly uploaded .php, .phtml, or .phar files
• Suspicious requests targeting com_jce
• Unknown administrator accounts
• Unexpected outbound connections
• Suspicious scheduled tasks or persistence mechanisms

Detection Ideas

Potential detection methods include:

• File Integrity Monitoring (FIM)
• Web server log analysis
• Detection of PHP execution from upload directories
• Monitoring JCE profile modifications
• SIEM alerts for unusual POST requests to JCE

Mitigation

Recommended actions:

• Update JCE to 2.9.99.5 or newer
• Remove unauthorized editor profiles
• Audit upload directories
• Disable PHP execution within upload directories
• Rotate credentials if compromise is suspected
• Review logs for exploitation attempts
• Restore from known-good backups if necessary

Affected Versions

Timeline

References

• NIST National Vulnerability Database (NVD)
• CVE Program (MITRE)
• Joomla Security Advisory
• CISA Known Exploited Vulnerabilities (KEV)
• SentinelOne Technical Analysis

Disclaimer

This repository is intended solely for educational, defensive, and research purposes.