CVE-2025-41396 Overview
CVE-2025-41396 is a path traversal vulnerability [CWE-22] in the file upload feature of multiple versions of Alfasado PowerCMS. Authenticated product users can supply crafted file paths that escape the intended upload directory and overwrite arbitrary files on the host. The flaw affects PowerCMS versions prior to 6.7.1, 5.3.1, and 4.6.1. Alfasado released fixed builds addressing the issue, tracked publicly through JVN advisory JVNVU93412964.
Critical Impact
An authenticated PowerCMS user can overwrite arbitrary files accessible to the web application, potentially corrupting site content, replacing configuration files, or staging follow-on code execution.
Affected Products
- Alfasado PowerCMS versions prior to 6.7.1
- Alfasado PowerCMS versions prior to 5.3.1
- Alfasado PowerCMS versions prior to 4.6.1
Discovery Timeline
- 2025-07-31 - CVE-2025-41396 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-41396
Vulnerability Analysis
The vulnerability resides in the file upload handler of PowerCMS. The application accepts a filename or path parameter from an authenticated user and uses it to write the uploaded content to disk without adequately normalizing or constraining the destination path.
An attacker with a valid PowerCMS account can supply traversal sequences such as ../ in the target filename. This causes the writer to resolve the destination outside the intended upload directory. Existing files reachable by the web server process can then be overwritten with attacker-controlled bytes.
Because the primary impact is arbitrary file overwrite rather than direct code execution, exploitation typically enables defacement, configuration tampering, or replacement of executable web content to pivot toward code execution. See the JVN Security Advisory JVNVU93412964 for further technical context.
Root Cause
The root cause is insufficient validation and canonicalization of user-supplied path input in the file upload feature. The handler concatenates the attacker-controlled filename with an upload base directory rather than validating the canonicalized target remains inside the intended directory tree.
Attack Vector
The attack is delivered over the network against the PowerCMS web interface and requires an authenticated session with upload privileges. No user interaction beyond the attacker's own request is required. A crafted upload request containing traversal sequences in the destination filename overwrites a file at an attacker-chosen location within the web server's write permissions.
No public proof-of-concept exploit or in-the-wild exploitation has been reported for CVE-2025-41396 at time of writing.
Detection Methods for CVE-2025-41396
Indicators of Compromise
- Web server access logs containing POST requests to PowerCMS upload endpoints with filename parameters containing ../, ..\, URL-encoded traversal (%2e%2e%2f), or absolute paths.
- Unexpected modifications to PowerCMS core files, template files, or configuration files with timestamps aligned to authenticated upload activity.
- New or altered files appearing outside the standard PowerCMS upload directories after user upload actions.
Detection Strategies
- Inspect application and web server logs for upload requests where the filename field contains directory separators or traversal tokens.
- Correlate PowerCMS authentication events with file system change events on the underlying host to surface uploads that touch unexpected paths.
- Deploy web application firewall rules that block path traversal patterns in multipart upload filename fields directed at PowerCMS endpoints.
Monitoring Recommendations
- Enable file integrity monitoring on PowerCMS application directories, template directories, and web-writable configuration paths.
- Alert on any write operation to PowerCMS binaries or PHP/Perl execution paths originating from the web server user.
- Review PowerCMS user accounts with upload privileges and audit their session activity for anomalous upload volume or targets.
How to Mitigate CVE-2025-41396
Immediate Actions Required
- Upgrade PowerCMS to version 6.7.1, 5.3.1, or 4.6.1 depending on the deployed release branch.
- Audit accounts with file upload privileges and remove or restrict access for users who do not require it.
- Review PowerCMS application, template, and configuration files for unauthorized modifications since the last known-good backup.
Patch Information
Alfasado has released fixed versions addressing CVE-2025-41396. See the PowerCMS Release Announcement 6.7.1 for the official patched builds and upgrade guidance. Administrators should apply the update matching their current major version branch.
Workarounds
- Restrict access to PowerCMS upload endpoints at the network or reverse-proxy layer to trusted administrative sources until patching is complete.
- Reduce the number of accounts holding upload permissions to the minimum required for operations.
- Deploy a web application firewall rule that rejects multipart upload requests whose filename field contains ../, ..\, or encoded equivalents.
# Example WAF-style filter to block traversal in filename fields
# (adapt to your ingress/WAF syntax)
SecRule ARGS_NAMES|FILES_NAMES "@rx (\.\./|\.\.\\|%2e%2e%2f|%2e%2e/)" \
"id:1004196,phase:2,deny,status:403,\
msg:'PowerCMS CVE-2025-41396 path traversal attempt'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
