{"id":"CVE-2026-111048","title":"FOSSBilling: Low-privileged staff can run JavaScript in administrators' browsers via stored XSS in support ticket notes","summary":"FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.9, the admin/support/note_create endpoint stores the note parameter without sanitization in the support_ticket_note table, and src/modules/Support…","severity":"high","cvss":8.4,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-79"],"vendor":"FOSSBilling","product":"FOSSBilling","affected":["FOSSBilling >= 0.1.0, < 0.8.9"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-11-03T17:49:08.850823Z"},"published":"2026-11-02","updated":"2026-11-03","sourceUpdated":"2026-11-03T18:34:11.706Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111048","references":[{"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-493h-fvcx-6q62","label":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-493h-fvcx-6q62"},{"url":"https://github.com/FOSSBilling/FOSSBilling/pull/4548","label":"https://github.com/FOSSBilling/FOSSBilling/pull/4548"},{"url":"https://github.com/FOSSBilling/FOSSBilling/commit/87528920b6cb1ba6f113583253eb4d7abdd1d8c6","label":"https://github.com/FOSSBilling/FOSSBilling/commit/87528920b6cb1ba6f113583253eb4d7abdd1d8c6"},{"url":"https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9","label":"https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9"}],"tags":["cve.org"],"epss":0.00278,"epssPercentile":0.20349,"ingestedAt":"2026-11-05T20:33:06.370Z","slug":"CVE-2026-111048","body":"## Overview\n\nFOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.9, the admin/support/note_create endpoint stores the note parameter without sanitization in the support_ticket_note table, and src/modules/Support/templates/admin/mod_support_tickets.html.twig renders each stored support ticket note through innerHTML in the admin ticket list. A staff user with only the support.manage_tickets permission can store HTML or JavaScript that executes when another staff member opens the ticket notes. The script runs with the viewing staff member's session and privileges, can read a CSRF token and accessible client or invoice data, and can perform administrative actions available to the viewer, including a Super Administrator. The ticket detail page is not affected because its Twig rendering uses autoescaping. This issue is fixed in version 0.8.9.\n\n## Affected\n\n- `FOSSBilling >= 0.1.0, < 0.8.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}