CVE-2025-6870 Overview
CVE-2025-6870 is an unrestricted file upload vulnerability in SourceCodester Simple Company Website 1.0, developed by oretnom23. The flaw resides in the /classes/Content.php?f=service endpoint, where the img parameter accepts attacker-controlled files without validation. An authenticated remote attacker with high privileges can upload arbitrary files to the server. The exploit has been publicly disclosed, raising the likelihood of opportunistic abuse against exposed instances. The weakness is classified under CWE-284: Improper Access Control.
Critical Impact
Public disclosure of the proof of concept enables authenticated remote attackers to upload arbitrary files via the img parameter, potentially leading to server-side code execution on vulnerable deployments.
Affected Products
- SourceCodester Simple Company Website 1.0
- Vendor: oretnom23
- Component: /classes/Content.php (service action handler)
Discovery Timeline
- 2025-06-29 - CVE-2025-6870 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in the NVD database
Technical Details for CVE-2025-6870
Vulnerability Analysis
The vulnerability affects the service content handler within /classes/Content.php. The handler accepts an img parameter supplied by the client and writes the file to the server without enforcing content-type, extension, or MIME validation. Because the application lacks allowlist checks on uploaded file types, an attacker can supply executable server-side scripts in place of expected image files. The uploaded file can then be requested via the web root, triggering execution within the PHP interpreter context.
The vulnerability is reachable over the network and requires authenticated access to the administrative content management workflow. Once a malicious file lands in a web-accessible directory, the attacker gains a foothold suitable for data access, defacement, or further lateral movement within the hosting environment.
Root Cause
The root cause is improper access control combined with missing file-type restrictions in the upload routine. The application trusts the img input and does not enforce server-side validation against an allowlist of permitted MIME types or extensions. Authorization checks also fail to constrain which file categories a privileged user may submit through the service content action.
Attack Vector
An attacker authenticates to the application with privileged credentials and issues a crafted POST request to /classes/Content.php?f=service. The request includes a malicious payload in the img field, such as a PHP web shell renamed with a double extension or a bypassed MIME type. The server stores the file in a web-reachable path, enabling the attacker to invoke the uploaded script directly. Technical details and reproduction steps are available in the GitHub PoC Issue Discussion and the VulDB entry #314342.
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Stop Identity AttacksDetection Methods for CVE-2025-6870
Indicators of Compromise
- Unexpected files with executable extensions (.php, .phtml, .phar) located in upload directories used by the Simple Company Website application.
- POST requests to /classes/Content.php?f=service carrying img parameters with non-image content or mismatched MIME types.
- Outbound connections or shell command execution originating from the web server process shortly after upload activity.
Detection Strategies
- Inspect web server access logs for requests to /classes/Content.php?f=service and correlate with subsequent GET requests to newly created files.
- Monitor the application's upload directory for file writes that do not match expected image MIME signatures.
- Deploy a web application firewall rule to flag multipart uploads where the declared Content-Type differs from the file content's magic bytes.
Monitoring Recommendations
- Enable file integrity monitoring on web root directories to alert on new or modified script files.
- Capture authentication events for the administrator role and correlate privileged sessions with upload activity.
- Log and retain full HTTP request bodies for the vulnerable endpoint to support forensic review.
How to Mitigate CVE-2025-6870
Immediate Actions Required
- Restrict network access to the Simple Company Website administrative interface using IP allowlists or VPN segmentation.
- Rotate credentials for all privileged users of the application and audit recent administrator logins.
- Review the upload directory and remove any unauthorized files, treating affected hosts as potentially compromised.
Patch Information
No vendor advisory or official patch has been published for CVE-2025-6870 at the time of writing. SourceCodester project pages, including SourceCodester Security Resources, should be monitored for updates. Operators running Simple Company Website 1.0 in production should consider decommissioning or replacing the application given the absence of a fix.
Workarounds
- Disable the vulnerable service content endpoint by removing or renaming /classes/Content.php if the functionality is not required.
- Enforce an upload allowlist at the web server layer that rejects files whose extension or magic bytes do not match permitted image formats.
- Configure the upload directory to deny script execution by setting php_flag engine off in a local .htaccess or equivalent server directive.
- Place the application behind a web application firewall with rules that block multipart uploads containing PHP tags or shell metacharacters.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
