Critical RCE in BridgeHead FileStore via Default Axis2 Credentials
The National Vulnerability Database (NVD) reports a critical remote code execution (RCE) vulnerability, CVE-2026-39920, impacting BridgeHead FileStore versions prior to 24A. This flaw stems from the exposure of the Apache Axis2 administration module on network-accessible endpoints, pre-configured with default credentials. This isn’t just a misconfiguration; it’s a gaping hole.
Attackers can leverage these default credentials to authenticate to the admin console. From there, they can upload a malicious Java archive, effectively deploying it as a web service. With this foothold, arbitrary OS commands can be executed on the host via SOAP requests to the newly deployed service, leading to full system compromise. The CVSS score of 9.8 (CRITICAL) accurately reflects the severity of this unauthenticated, network-exploitable path to RCE.
This is a classic ‘default credentials’ failure, compounded by an exposed administrative interface. Defenders running BridgeHead FileStore must assume compromise if their systems were exposed and unpatched. The attacker’s calculus is straightforward: find exposed instances, log in, and take over. This is low-effort, high-impact exploitation.
What This Means For You
- If your organization uses BridgeHead FileStore, specifically versions prior to 24A, you need to immediately verify if the Apache Axis2 administration module is exposed and whether default credentials are in use. Patch to version 24A or later without delay. More importantly, audit your network for any exposed administrative interfaces and enforce strong, unique credentials across all systems. Assume compromise if you were running vulnerable versions and had network exposure; initiate incident response protocols.
Related ATT&CK Techniques
🛡️ Detection Rules
4 rules · 6 SIEM formats4 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-39920 - BridgeHead FileStore Axis2 Default Credentials RCE
title: CVE-2026-39920 - BridgeHead FileStore Axis2 Default Credentials RCE
id: scw-2026-04-24-ai-1
status: experimental
level: critical
description: |
Detects access to the Apache Axis2 administration console via default credentials, a key step in exploiting CVE-2026-39920. This rule specifically targets the '/axis2/axis2-admin' path commonly used for administrative tasks within Axis2.
author: SCW Feed Engine (AI-generated)
date: 2026-04-24
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-39920/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/axis2/axis2-admin'
cs-method:
- 'POST'
sc-status:
- '200'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-39920 | RCE | BridgeHead FileStore < 24A |
| CVE-2026-39920 | Auth Bypass | Apache Axis2 administration module with default credentials |
| CVE-2026-39920 | Command Injection | Apache Axis2 administration module via SOAP requests to deployed service |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 24, 2026 at 19:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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