CVE-2026-81440: Dell OpenManage Hard-coded Credentials Flaw

CVE-2026-81440 Overview

CVE-2026-81440 is a hard-coded credentials vulnerability in Dell OpenManage Server Administrator (OMSA) versions prior to 11.1.0.3. The flaw is tracked under CWE-798: Use of Hard-coded Credentials. An unauthenticated remote attacker can leverage the embedded credentials to gain unauthorized access to the management interface. OMSA runs on Dell PowerEdge servers and provides administrative control over hardware components, making exposed instances a direct path to server infrastructure. Dell addressed the issue in security advisory DSA-2026-403.

Critical Impact

Unauthenticated remote attackers can authenticate using hard-coded credentials to gain unauthorized access to Dell server management functions.

Affected Products

• Dell OpenManage Server Administrator (OMSA) versions prior to 11.1.0.3
• Dell PowerEdge server deployments running vulnerable OMSA builds
• Management workstations exposing OMSA network services

Discovery Timeline

• 2026-09-17 - CVE-2026-81440 published to the National Vulnerability Database
• 2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-81440

Vulnerability Analysis

Dell OpenManage Server Administrator ships with credentials embedded in the product itself. Because these credentials are fixed across installations, any attacker who obtains them, whether through binary analysis, prior disclosure, or configuration inspection, can authenticate to every affected instance. The vulnerability is reachable over the network without user interaction. This exposes the server management surface, allowing an attacker to interact with OMSA functions intended for privileged administrators.

Root Cause

The root cause is the presence of static, non-configurable credentials within the OMSA distribution. CWE-798 describes this pattern: authentication logic accepts a credential value that is compiled or configured into the software and cannot be rotated by the operator. Because the credential is identical on every deployment, disclosure of a single copy breaks authentication for the entire installed base.

Attack Vector

Exploitation requires network access to an OMSA endpoint. An attacker sends authentication requests using the hard-coded credentials to the OMSA service and receives a valid session. From that session the attacker can query and interact with server administration functions exposed by OMSA. No prior privileges and no user interaction are required, and the attack complexity is low. The technical details are documented in the Dell Security Update DSA-2026-403.

No public proof-of-concept code has been released. See the vendor advisory for further technical details.

Detection Methods for CVE-2026-81440

Indicators of Compromise

• Successful OMSA authentication events from unexpected source IP addresses or outside administrative networks
• OMSA session activity originating from hosts that do not belong to the server management VLAN
• Configuration changes or hardware queries in OMSA logs that do not correlate with a known administrator action

Detection Strategies

• Inventory all Dell PowerEdge hosts and identify OMSA installations with a version lower than 11.1.0.3
• Alert on inbound network connections to OMSA ports from non-management network segments
• Correlate OMSA authentication logs with change management records to identify unauthorized administrative sessions

Monitoring Recommendations

• Forward OMSA application and authentication logs to a centralized log platform for retention and correlation
• Monitor for repeated authentication attempts to OMSA endpoints, particularly from external or untrusted ranges
• Track outbound connections from servers running OMSA that could indicate post-authentication misuse

How to Mitigate CVE-2026-81440

Immediate Actions Required

• Upgrade Dell OpenManage Server Administrator to version 11.1.0.3 or later on all affected hosts
• Restrict network access to OMSA services so that only dedicated management workstations can reach them
• Review OMSA authentication and audit logs for evidence of unauthorized access preceding the upgrade

Patch Information

Dell has released a fixed version of OpenManage Server Administrator that removes the hard-coded credentials. Administrators should install OMSA 11.1.0.3 or later. Full remediation guidance is available in the Dell Security Update DSA-2026-403.

Workarounds

• Place OMSA endpoints on an isolated out-of-band management network unreachable from user or internet-facing segments
• Enforce host-based firewall rules that permit OMSA traffic only from approved administrator source addresses
• Disable the OMSA web service on servers where it is not actively required until the patch can be applied

# Example host firewall restriction limiting OMSA (default TCP 1311) to a management subnet
iptables -A INPUT -p tcp --dport 1311 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 1311 -j DROP