CVE Alert: CVE-2025-10116 – n/a – SiempreCMS

**Risk verdict**: High risk due to unauthenticated remote unrestricted file upload via an admin endpoint, with a publicly available exploit.

**Why this matters**: An attacker can upload arbitrary files, potentially PHP scripts, and access or execute them on the server. Even with limited direct impact per CVSS, this can lead to web shell access, defacement, or data exposure, especially if uploads land in or are served from the web root.

**Most likely attack path**: Remote attacker targets the /docs/admin/file_upload.php endpoint, exploiting lack of access controls. No user interaction or privileges required makes exploitation straightforward; once a payload is uploaded, the attacker can attempt to access or execute it from the web server, enabling further compromise or impact.

**Who is most exposed**: Web deployments of SiempreCMS 1.3.x in public-facing hosting environments (shared or small/medium setups) with web-accessible admin paths are most at risk, particularly where uploads are not strictly sandboxed or isolated from the web root.

Detection ideas

• Sudden creation of new files in the upload directory, especially with unusual names or PHP extensions.
• HTTP requests to the upload endpoint containing suspicious content-type or payloads designed to bypass validation.
• Access attempts to recently uploaded files (and unexpected execution results or errors).
• Anomalous spikes in upload activity from unauthenticated sources.
• Logs showing failed or unusual permission changes around the upload area.

Mitigation and prioritisation

• Patch to a fixed version or apply vendor-supplied mitigations; disable unrestricted uploads if possible.
• Enforce strict server-side validation of file type, size, and content; forbid executable extensions in the upload path.
• Move uploads outside the web root and/or configure the server to deny execution in the upload directory; apply proper access controls to the admin area.
• Implement authentication-required upload forms with CSRF protection and audit logging.
• Enable WAF/IPS rules for suspicious file upload patterns and file-name abuse; coordinate with change-management for a controlled deployment.