{"affected":[{"product":"FOSSBilling","source":"CNA: GitHub_M","vendor":"FOSSBilling","versions":[{"status":"affected","version":">= 0.1.0, < 0.8.9"}]}],"cveId":"CVE-2026-111048","cwes":["CWE-79"],"description":"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/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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.4,"severity":"high","source":"CNA: GitHub_M","vector":"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","version":"4.0"}],"modifiedAt":1793641571754,"publishedAt":1793641571754,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-493h-fvcx-6q62"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/FOSSBilling/FOSSBilling/pull/4548"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/FOSSBilling/FOSSBilling/commit/87528920b6cb1ba6f113583253eb4d7abdd1d8c6"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9"}],"remediation":[],"revision":"f5aac81581e8da7698626f6657c31fa6d75db8b83989c5650eb34c45def43950","sources":[{"modifiedAt":1793641571754,"name":"CNA: GitHub_M","retrievedAt":1793642933046,"url":"https://www.cve.org/CVERecord?id=CVE-2026-111048"}],"ssvc":null,"status":"published","title":"FOSSBilling: Low-privileged staff can run JavaScript in administrators' browsers via stored XSS in support ticket notes","updatedAt":1793642933046}