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CVE-2026-111048

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

High8.4
Published
Updated
Reserved
Assigned by
GitHub_M

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.

Scores

CVSS scores of CVE-2026-111048, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)4.0High8.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
NVDNVD · Deferred4.0High8.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
Not scored

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.

Weakness

Affected products

  • FOSSBilling · FOSSBilling

    • affected >= 0.1.0, < 0.8.9

References (4)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .