---
id: CVE-2026-100720
title: Froxlor 2.0.0 through 2.3.10 is vulnerable to stored cross-site scripting
summary: >-
  Froxlor 2.0.0 through 2.3.10 is vulnerable to stored cross-site scripting.
  When a customer (the lowest-privileged authenticated role) uploads an SSL
  certificate for one of their own domains, the Certificates API add()/update()
  methods pa…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: froxlor
product: froxlor
affected:
  - froxlor >= 2.0.0 < 2.3.12
published: '2026-09-26'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T14:16:58.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100720'
references:
  - url: 'https://github.com/froxlor/froxlor/security/advisories/GHSA-89vj-gqqr-73p8'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/froxlor-before-2.3.12-stored-xss-via-ssl-certificate-issuer
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-26T13:33:20.890Z'
---

## Overview

Froxlor 2.0.0 through 2.3.10 is vulnerable to stored cross-site scripting. When a customer (the lowest-privileged authenticated role) uploads an SSL certificate for one of their own domains, the Certificates API add()/update() methods parse it with openssl_x509_parse() and store the issuer organization (issuer['O']) value verbatim without sanitization. Froxlor's table-listing renderer then emits scalar cells through Twig's `raw` filter, disabling HTML auto-escaping, so when an administrator or reseller opens Domains > SSL certificates the attacker-supplied issuer value executes as script in the privileged user's session. This crosses a privilege boundary from customer to admin and can result in full administrator account takeover; because a Froxlor admin controls webserver, DNS, and PHP configuration applied by a cron job running as root, the issue can be further escalated to command execution as root on the managed server. The issue is fixed in Froxlor 2.3.12.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.