---
title: "CVE-2026-111048: FOSSBilling - Stored XSS"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-111048/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-111048)

## 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](https://cwe.mitre.org/data/definitions/79.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-111048](https://nvd.nist.gov/vuln/detail/CVE-2026-111048)
- [https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-493h-fvcx-6q62](https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-493h-fvcx-6q62)
- [https://github.com/FOSSBilling/FOSSBilling/commit/87528920b6cb1ba6f113583253eb4d7abdd1d8c6](https://github.com/FOSSBilling/FOSSBilling/commit/87528920b6cb1ba6f113583253eb4d7abdd1d8c6)
- [https://github.com/FOSSBilling/FOSSBilling/pull/4548](https://github.com/FOSSBilling/FOSSBilling/pull/4548)
- [https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9](https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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