CVE-2026-111053
FOSSBilling is an open source billing and client-management platform
- Risk score
- 47/100
- CVSS
- 6.9 v4.0
- Exploit chance (30 days)
- 0.4%
- Published
- 19 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 resolv…
- Affected
- See advisory
- Fix
- Upgrade the product to 0.8.7 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 6.9 medium
References
Original description
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.
Last activity 19 Oct 2026. Patch Forecast updates every hour.