CVE-2026-111053
CVE-2026-111053 · FOSSBilling: Unauthenticated attacker can probe existence of arbitrary files via guest/system/template_exists
This page contains facts from public vulnerability sources. Check the original advisory before updating.
FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/template_exists endpoint permits path traversal because templateExists uses Path::join on the attacker-controlled file parameter without rejecting .. sequences or verifying that the resolved path remains inside the active theme directory. The trigger is an unauthenticated request to guest/system/template_exists containing traversal sequences in the file parameter. An attacker can submit traversal sequences in the file parameter and observe the returned boolean to determine whether arbitrary files or directories exist on the server. The oracle does not disclose file contents. This issue is fixed in version 0.8.7.
CVSS 6.9 · Medium · EPSS 0.4%
- Published
- Updated
Affected products and versions
fossbilling
- Versions
- >= 0.1.0, < 0.8.7: Affected
No fix published
Original sources
- https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-fm3x-cx5r-wwgp
- https://github.com/FOSSBilling/FOSSBilling/pull/4221
- https://github.com/FOSSBilling/FOSSBilling/commit/e6ca7731c6bce406aba11900a4450e89c4ebdb01
- https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.7
- https://nvd.nist.gov/vuln/detail/CVE-2026-111053