Quick answers
- Is CVE-2026-53645 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-53645 being exploited in the wild.
- How severe is CVE-2026-53645?
- Informational severity, with a CVSS score of 8.5, published 6 July 2026.
- Which products and versions are affected?
- FOSSBilling < 0.8.0.
- Is there a fix for CVE-2026-53645?
- A patch was published on 2026-08-01: Version 0.8.0 released to address the issue Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-53645 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-53645?
- Check whether you run FOSSBilling at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An authorization bypass exists in the FOSSBilling admin API due to missing self-edit prevention and privilege-ceiling enforcement. Specifically, the `permissions_update` endpoint in `src/modules/Staff/Api/Admin.php` allows any staff user with the `staff.create_and_edit_staff` permission to call the `/api/admin/staff/permissions_update` endpoint. Because the underlying `setPermissions()` service method does not verify if the target ID matches the caller's ID or restrict the scope of permissions being granted, a low-privileged user can submit a JSON structure granting themselves access to all system modules. This results in persistent privilege escalation stored in the database. The issue is resolved in version 0.8.0.
Affected products
- FOSSBilling FOSSBilling < 0.8.0
Timeline
- 2026-06-12: advisory: GitHub Security Advisory published
- 2026-07-06: disclosed: NVD publication date
- 2026-08-01: patched: Version 0.8.0 released to address the issue