# StoneFly Storage Concentrator critical RCE flaws

Published: 2026-06-30 · Severity: routine · Sectors: defense, energy, financial-services, healthcare, technology
Canonical: https://vorant.io/reports/e88bcafa-24dd-5fa6-9c16-5995301d3205/stonefly-storage-concentrator-critical-rce-flaws

> CISA disclosed five vulnerabilities in StoneFly Storage Concentrator enabling unauthenticated remote attackers to execute commands as root, steal credentials, and extract database contents.

CISA published an advisory detailing five vulnerabilities in StoneFly Storage Concentrator and Storage Concentrator Virtual Machine products affecting versions prior to 8.0.4.29. The most severe flaws include two unauthenticated remote command injection vulnerabilities (CVE-2026-56413, CVE-2026-56415) that allow arbitrary code execution with root privileges. CVE-2026-56413 affects the ms_service.pl service listening on TCP port 9000, while CVE-2026-56415 exploits the debug.pl script via crafted HTTP requests.

Additional vulnerabilities include hardcoded credentials for internal services stored in reversible encoding (CVE-2026-50110), an unauthenticated SQL injection flaw via cookie manipulation (CVE-2026-55721) that can extract session tokens and password hashes, and a reflected XSS vulnerability in 404 error pages (CVE-2026-50040). The affected products are deployed globally across critical infrastructure sectors including Defense Industrial Base, Energy, Financial Services, Healthcare, and Information Technology. StoneFly has released version 8.0.4.29 to remediate all disclosed vulnerabilities.

The vulnerabilities were discovered and reported by David Yesland of Rhino Security Labs. CISA reports no known public exploitation at the time of publication but emphasizes the severity of potential impact, noting successful exploitation could provide broad unauthorized access to multiple interconnected systems. Organizations using affected versions should prioritize patching, and CISA recommends implementing network segmentation and restricting internet exposure of control system devices as defensive measures.

## Mentioned in this report

- Vulnerabilities: CVE-2026-50040, CVE-2026-50110, CVE-2026-55721, CVE-2026-56413, CVE-2026-56415

## Detection guidance (public sample)

### HTTP Command Injection Attempt Against StoneFly ms_service.pl or debug.pl Endpoints

ATT&CK: T1190

Detects HTTP requests to StoneFly Storage Concentrator's ms_service.pl (port 9000) or debug.pl scripts containing shell metacharacters indicative of unauthenticated command injection (CVE-2026-56413, CVE-2026-56415). Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: HTTP Command Injection Attempt Against StoneFly ms_service.pl or debug.pl
id: 872b9dcf-de75-5df5-a2eb-c8335f56fd8a
status: experimental
description: Detects HTTP requests targeting StoneFly Storage Concentrator ms_service.pl
  (TCP 9000) or debug.pl endpoints that contain shell metacharacters or command chaining
  sequences consistent with unauthenticated remote command injection exploitation
  (CVE-2026-56413, CVE-2026-56415).
references:
- https://www.cisa.gov/news-events/ics-advisories
author: Vorant
tags:
- attack.t1190
- attack.t1059
logsource:
  category: webserver
detection:
  selection_endpoint:
    cs-uri-stem|contains:
    - ms_service.pl
    - debug.pl
  selection_injection:
    cs-uri-query|contains:
    - ;
    - '|'
    - '`'
    - $(
    - '&&'
    - ../
    - 'wget '
    - 'curl '
    - /bin/sh
    - /bin/bash
  condition: selection_endpoint and selection_injection
falsepositives:
- Legitimate administrative debug requests that happen to include pipe or ampersand
  characters in parameter values
- Automated vulnerability scanning by authorized security tools
level: high
```

### Shell Command Execution Spawned by Perl CGI Process on Storage Appliance

ATT&CK: T1059

Detects a shell or interpreter process spawned by a perl process (e.g. ms_service.pl/debug.pl handler), consistent with successful command injection RCE on StoneFly Storage Concentrator. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: Shell Spawned From Perl CGI Process on Storage Appliance
id: a03af877-8437-5106-8239-9e14788fcf17
status: experimental
description: Detects a shell interpreter (sh, bash, dash) being spawned as a child
  of a perl process, matching the exploitation pattern for StoneFly ms_service.pl
  and debug.pl unauthenticated command injection vulnerabilities that execute arbitrary
  commands with root privileges.
references:
- https://www.cisa.gov/news-events/ics-advisories
author: Vorant
tags:
- attack.t1059
- attack.t1190
logsource:
  category: process_creation
  product: linux
detection:
  selection_parent:
    ParentImage|endswith:
    - /perl
    - /perl5
  selection_child:
    Image|endswith:
    - /sh
    - /bash
    - /dash
  selection_suspicious_args:
    CommandLine|contains:
    - id
    - whoami
    - wget
    - curl
    - /etc/passwd
    - 'nc '
    - chmod +x
  condition: selection_parent and selection_child and selection_suspicious_args
falsepositives:
- Legitimate perl-based CGI scripts that intentionally shell out for system administration
  tasks
- Vendor maintenance scripts invoking diagnostic commands through perl wrappers
level: high
```

### Potential SQL Injection via Cookie Header on StoneFly Web Interface

ATT&CK: T1552.001

Detects HTTP requests carrying SQL injection payloads inside the Cookie header targeting session/authentication endpoints, consistent with CVE-2026-55721 used to extract session tokens and password hashes. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: SQL Injection Payload in Cookie Header Targeting Session Endpoint
id: d4023623-af06-5a47-b0c7-86be2d381844
status: experimental
description: Detects HTTP requests where the Cookie header contains SQL injection
  syntax such as UNION SELECT or boolean tautologies, matching the unauthenticated
  SQL injection technique used against StoneFly Storage Concentrator to extract session
  tokens and password hashes (CVE-2026-55721).
references:
- https://www.cisa.gov/news-events/ics-advisories
author: Vorant
tags:
- attack.t1552.001
- attack.t1078
logsource:
  category: proxy
detection:
  selection_cookie_sqli:
    c-cookie|contains:
    - UNION SELECT
    - union select
    - ''' OR ''1''=''1'
    - ''' or 1=1'
    - --
    - sleep(
    - SLEEP(
  condition: selection_cookie_sqli
falsepositives:
- Security scanners or penetration testing tools deliberately probing cookie parameters
- Applications that legitimately store SQL-like text within cookie values for internal
  debugging
level: medium
```

Behavioural rules are generated from public reporting — validate in your environment before deploying.

Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-181-06

---

This is the free public brief from Vorant Threat Intelligence. When citing, attribute "Vorant" and link https://vorant.io/reports/e88bcafa-24dd-5fa6-9c16-5995301d3205/stonefly-storage-concentrator-critical-rce-flaws.
Full IOC sets, deployable detections, the entity graph, TAXII 2.1 feed and real-time alerts: https://vorant.io/signup