CVE-2026-53642 FOSSBilling: Unverified clients can access client-area pages when email confirmation is required
Unverified clients can access sensitive account data in FOSSBilling when email confirmation is enabled, exposing balances and transaction history.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53642?
CVE-2026-53642 is a medium-severity missing authorization vulnerability in FOSSBilling, published on 6 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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 (`email_approved = 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-53642?
How do I fix CVE-2026-53642?
No fix has been published for CVE-2026-53642 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-53642 being exploited?
There is no known exploitation of CVE-2026-53642 in the wild and no public exploit code.
Sources
Also known as GHSA-7v47-rh46-w923.