CVE-2026-111048 - FOSSBilling: Low-privileged staff can run JavaScript in administrators' browsers via stored XSS in sup

[Starburst-David]

CVE-2026-111048 - FOSSBilling: Low-privileged staff can run JavaScript in administrators' browsers via stored XSS in support ticket notes

CVE ID :CVE-2026-111048
Published : Nov. 2, 2026
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.
Severity: 8.4 | HIGH

More Information:
https://cvefeed.io/vuln/detail/CVE-2026-111048