CVE-2026-53648
MediumCVSS 5.1Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
In FOSSBilling prior to version 0.8.1, downloadable product files are stored using a deterministic filename-derived path (MD5 hash). Two different products or order files with the same original filename overwrite each other, causing customers or administrators to receive the wrong file.
Risk Assessment
The organization risks delivering unauthorized or malicious files to customers instead of ordered products, potentially leading to data integrity breaches, loss of trust, and legal consequences.
Recommendation
Immediately upgrade FOSSBilling to version 0.8.1 or later. As a temporary workaround, restrict the 'servicedownloadable.manage' permission to fully trusted administrators and ensure unique filenames before upload.
Original NVD description (English source)
FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.1, downloadable product files are stored using a deterministic filename-derived path. When an administrator uploads a file for a downloadable product, FOSSBilling stores the file as `md5(<original filename>)` under the uploads directory. Because the stored path depends only on the client-supplied filename, two different downloadable products, or product/order files, uploaded with the same original filename will resolve to the same stored file path. A later upload can overwrite an earlier upload, causing customers or administrators downloading the earlier product to receive the later file instead. Version 0.8.1 patches the issue. Some workarounds are available. Restrict the `servicedownloadable.manage` permission to fully trusted administrators only. As an operational mitigation, ensure downloadable product files use unique filenames before upload. This reduces accidental collisions but does not fully address the underlying issue.