---
id: CVE-2026-112353
title: GFI KerioConnect < 10.0.8p2 Stored XSS via SVG Attachment
summary: >-
  GFI KerioConnect (Kerio Connect) before 10.0.8 Patch 2 contains a stored
  cross-site scripting vulnerability in the Webmail component that allows a
  remote attacker to run JavaScript in a victim's authenticated Webmail session
  by uploading…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
  - CWE-83
vendor: 'GFI USA, LLC'
product: GFI KerioConnect
affected:
  - gfi_kerioconnect < 10.0.8p2
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T16:10:08.568Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112353'
references:
  - url: 'https://gfi.ai/resource/kerioconnect-product-releases/'
    label: Release Notes
  - url: >-
      https://www.vulncheck.com/advisories/gfi-kerioconnect-8p2-stored-xss-via-svg-attachment
    label: >-
      VulnCheck Advisory: GFI KerioConnect < 10.0.8p2 Stored XSS via SVG
      Attachment
tags:
  - cve.org
ingestedAt: '2026-10-27T16:32:34.409Z'
---

## Overview

GFI KerioConnect (Kerio Connect) before 10.0.8 Patch 2 contains a stored cross-site scripting vulnerability in the Webmail component that allows a remote attacker to run JavaScript in a victim's authenticated Webmail session by uploading a crafted SVG email attachment that bypasses sanitization of event-handler attributes. Attackers can exploit the temporary-download endpoint's insufficient Content-Security-Policy sandbox to execute scripts when the attachment is opened, enabling theft of the victim's credentials and mailbox contents. Proofpoint Threat Research has observed exploitation in the wild as a credential and mailbox stealer.

## Affected

- `gfi_kerioconnect < 10.0.8p2`

## Remediation

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