CVE-2026-53642: FOSSBilling: Unverified clients can access client-area pages when email confirmation is required

Published Jul 6, 2026
·
Updated

FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when the "Require Email Confirmation" setting is enabled, a logged-in client with an unverified email address (emailapproved = 0) can access all client-area pages (e.g. /client/balance, /client/order/list, /client/invoice) and read real account data, including wallet balances and transaction history. The API-side enforcement correctly restricts unverified clients to only profile-related endpoints, but the page-side enforcement is overly permissive, allowing any request whose path starts with /client. Version 0.8.0 contains a fix. No known workarounds that don't involve modifying the source code are available.

Affected Software

2 affected components
fossbilling fossbilling>=0.5.6<=0.7.2
fossbilling fossbilling=0.8.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade FOSSBilling to a version that resolves this vulnerability.

    Fixed in 0.8.0
  2. Compensating control

    If upgrading to FOSSBilling 0.8.0 is not immediately possible, restrict/deny access to client-area pages (paths starting with /client, including /client/balance, /client/order/list, and /client/invoice) for users with unverified emails (email_approved = 0) at the web tier (e.g., via reverse-proxy/WAF/ACL), since page-side enforcement in 0.5.6–0.7.2 is overly permissive.

Event History

Jul 6, 2026
CVE Published
via MITRE·10:45 PM
Data Sourced
via MITRE·10:45 PM
DescriptionWeakness
Data Sourced
via NVD·11:16 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-53642?

The severity of CVE-2026-53642 is rated at 45.

2

How do I fix CVE-2026-53642?

To fix CVE-2026-53642, update FOSSBilling to version 0.7.3 or later.

3

What issue does CVE-2026-53642 pose?

CVE-2026-53642 allows logged-in clients with unverified email addresses to access restricted client-area pages.

4

Which versions of FOSSBilling are affected by CVE-2026-53642?

FOSSBilling versions from 0.5.6 through 0.7.2 are affected by CVE-2026-53642.

5

Is there a workaround for CVE-2026-53642?

There is no officially recommended workaround for CVE-2026-53642 other than updating to a fixed version.

Company

Resources

Contact

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