Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-53648— FOSSBilling: Downloadable product files can be overwritten through filename collisions

Quick assessment

Affected
FOSSBilling FOSSBilling
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

fossbilling是fossbilling团队开源的一种高效计费和客户管理方案。 FOSSBilling 0.8.1之前版本存在安全漏洞，该漏洞源于可下载产品文件使用确定性的基于文件名的路径存储，导致相同原始文件名的不同产品上传会解析到相同的存储路径，后上传的文件可能覆盖先前上传的文件，使得下载先前产品的用户收到后续文件。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1565.001 · Stored Data Manipulation

Affected Version Matrix 1

VendorProduct Version RangeStatus
FOSSBilling FOSSBilling < 0.8.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-53648

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
FOSSBilling: Downloadable product files can be overwritten through filename collisions
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
FOSSBilling 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fossbilling是fossbilling团队开源的一种高效计费和客户管理方案。 FOSSBilling 0.8.1之前版本存在安全漏洞，该漏洞源于可下载产品文件使用确定性的基于文件名的路径存储，导致相同原始文件名的不同产品上传会解析到相同的存储路径，后上传的文件可能覆盖先前上传的文件，使得下载先前产品的用户收到后续文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FOSSBilling FOSSBilling < 0.8.1 -

II. Public POCs for CVE-2026-53648

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-53648

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-53648 (1)

Same Patch Batch · FOSSBilling · 2026-07-06 · 17 CVEs total

CVE-2026-42341 FOSSBilling has an unauthenticated payment bypass via IPN callback forgery
CVE-2026-42331 FOSSBilling missing authorization in guest Invoice API endpoints
CVE-2026-33734 FOSSBilling has improper SQL neutralization in `Massmailer` recipient filters
CVE-2026-43921 FOSSBilling vulnerable to arbitrary PHP code injection via unescaped config serialization
CVE-2026-43918 Suspended or inactive FOSSBilling accounts can retain or regain access through existing se
CVE-2026-43927 FOSSBilling has race condition in cart checkout that bypasses promo code usage limits
CVE-2026-43925 FOSSBilling: Mass assignment of group_id in guest client registration allows unauthorized
CVE-2026-43928 FOSSBilling: Payment amount not validated in PayPalEmail adapter allows invoice underpayme
CVE-2026-53640 FOSSBilling missing authorization checks on read-only admin API endpoints expose sensitive
CVE-2026-53641 FOSSBilling has stored XSS in client email views via unescaped content in JavaScript templ
CVE-2026-53645 FOSSBilling's missing self-edit prevention in staff permission management allows persisten
CVE-2026-53646 FOSSBilling: Client password reset token reuse allows persistent account takeover
CVE-2026-53643 FOSSBilling allows low-privileged staff accounts to perform unauthorized actions via admin
CVE-2026-53644 FOSSBilling's missing order-state validation allows clients to read and reset API key secr
CVE-2026-53642 FOSSBilling: Unverified clients can access client-area pages when email confirmation is re
CVE-2026-53647 FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Servi

IV. Related Vulnerabilities

Same product: FOSSBilling
Same vendor: FOSSBilling
Same weakness: CWE-73

V. Comments for CVE-2026-53648

No comments yet

Leave a comment