CVE-2026-48189 — OTRS Customer Backend Module Vulnerability
CVE-2026-48189 — An improper Input Validation vulnerability in OTRS Customer Backend module allows to access customer information which are restricted to other groups. Please note that the feature has to be anabled and CustomerGroupSupport has to be used to be affected. This issue affects OTRS:
What This Means For You
- If your environment is affected by CWE-200, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-48189 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-48189 - OTRS Customer Backend Information Disclosure
title: CVE-2026-48189 - OTRS Customer Backend Information Disclosure
id: scw-2026-06-01-ai-1
status: experimental
level: high
description: |
This rule detects attempts to exploit CVE-2026-48189 by targeting the OTRS Customer Backend module. The vulnerability allows unauthorized access to customer information by manipulating the 'Action' and 'Subaction' parameters in the URI query, specifically when 'CustomerGroupSupport' is enabled. This detection focuses on the specific URI pattern associated with the vulnerable functionality.
author: SCW Feed Engine (AI-generated)
date: 2026-06-01
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-48189/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/otrs/index.pl'
cs-uri-query|contains:
- 'Action=Customer&Subaction=TicketList'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-48189 | vulnerability | CVE-2026-48189 |
| CWE-200 | weakness | CWE-200 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | June 01, 2026 at 07:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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