{"id":"CVE-2026-111053","revision":null,"records":[{"revision":"995b32021f83406f93ed38ee9f67794a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-111053","aliases":[],"title":"FOSSBilling: Unauthenticated attacker can probe existence of arbitrary files via guest/system/template_exists","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.","state":0,"publishedAt":"2026-10-19T15:54:17.61+00:00","modifiedAt":"2026-10-19T16:36:49.366+00:00","affected":[{"ecosystem":"Vendor product","name":"FOSSBilling","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"FOSSBilling\",\n                    \"product\": \"FOSSBilling\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.1.0, < 0.8.7\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.9,"severity":"MEDIUM"}],"references":["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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111053","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-111053","identifiers":["CVE-2026-111053"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EPSS backfill.","generation":"2026-11-08T23:02:15.9754883+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-08T23:02:15.9754883+00:00","lastSuccessAt":"2026-11-08T23:02:16.1192591+00:00","error":null,"lastVerifiedAt":"2026-11-08T23:02:16.1192597+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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