CVE WatchOct 19, 2026

CVE-2026-111053

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/template_

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

0-100

Published: Oct 19, 2026 · Last modified: Oct 19, 2026 · CWE-22 · CWE-200

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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