---
id: CVE-2026-103905
title: |-
  The authentication middleware of the JTL-Shop
  administration backend processes the plugin safe mode toggle on the admin
  logout route before checking whether the requesting user is
  authenticated
summary: |-
  The authentication middleware of the JTL-Shop
  administration backend processes the plugin safe mode toggle on the admin
  logout route before checking whether the requesting user is
  authenticated. An unauthenticated remote attacker can the…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-306
vendor: JTL-Software GmbH
product: JTL-Shop
affected:
  - JTL-Shop >= 5.3.0 < 5.6.5
  - JTL-Shop >= 5.7.0 < 5.7.5
  - JTL-Shop >= 5.8.0 < 5.8.2
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:04:29.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103905'
references:
  - url: 'https://www.jtl-software.com/de/security/shop-maintenance-mode'
    label: a6d3dc9e-0591-4a13-bce7-0f5b31ff6158
tags:
  - nvd
  - cve.org
epss: 0.00531
epssPercentile: 0.44676
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-14T14:10:48.774437Z'
ingestedAt: '2026-10-14T11:27:22.143Z'
---

## Overview

The authentication middleware of the JTL-Shop
administration backend processes the plugin safe mode toggle on the admin
logout route before checking whether the requesting user is
authenticated. An unauthenticated remote attacker can therefore switch the shop's
plugin safe mode on and off, which deactivates all installed plugins and their
functionality, such as payment and shipping integrations, resulting in a shop-wide
denial of service. The attack requires a single request and can be
automated against many installations.

## Remediation

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