CVE-2026-111048 FOSSBilling - Stored XSS

FOSSBilling 0.1.0 to 0.8.9 contains a stored XSS caused by unsanitized note parameter stored in support_ticket_note and rendered via innerHTML in admin ticket list, letting staff users with support.manage_tickets permission execute scripts with viewer's privileges, exploit requires staff user permission.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Stored XSS
Impact
Client Script Exec, Information Disclosure, Privilege Escalation
CVSS 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/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
Published
2 November 2026
Updated
3 November 2026
Weakness
CWE-79

Vendor fix

Update to version 0.8.9 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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