CVE-2026-21940 Overview
CVE-2026-21940 is an information disclosure vulnerability in the Oracle Agile PLM product of Oracle Supply Chain, specifically affecting the User and User Group component. This vulnerability allows unauthenticated attackers with network access via HTTP to compromise Oracle Agile PLM and gain unauthorized access to critical data or complete access to all accessible data within the application.
Critical Impact
Unauthenticated network attackers can exploit this vulnerability to access sensitive data without any authentication, potentially exposing confidential product lifecycle management information across the enterprise.
Affected Products
- Oracle Agile PLM version 9.3.6
- Oracle Supply Chain (User and User Group component)
Discovery Timeline
- January 20, 2026 - CVE-2026-21940 published to NVD
- January 21, 2026 - Last updated in NVD database
Technical Details for CVE-2026-21940
Vulnerability Analysis
This vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The flaw exists within the User and User Group component of Oracle Agile PLM, where insufficient access controls allow unauthorized parties to retrieve sensitive information. The vulnerability is characterized by its ease of exploitation, requiring no authentication and no user interaction.
An attacker can remotely exploit this vulnerability over the network via HTTP protocol. The impact is confined to confidentiality, meaning attackers can read sensitive data but cannot modify or delete information. This makes it particularly dangerous for organizations storing proprietary product designs, supplier information, or confidential business data within the PLM system.
Root Cause
The root cause stems from improper information exposure within the User and User Group component. The application fails to adequately validate or restrict access to sensitive data endpoints, allowing unauthenticated users to retrieve information that should be protected. This represents a fundamental access control weakness in how the component handles data requests from network clients.
Attack Vector
The attack vector is network-based, requiring the attacker to have HTTP access to the Oracle Agile PLM instance. The exploitation process involves:
- Identifying an exposed Oracle Agile PLM instance running version 9.3.6
- Targeting the User and User Group component endpoints
- Sending crafted HTTP requests without authentication credentials
- Receiving unauthorized access to sensitive PLM data in the response
The attack requires no privileges, no user interaction, and has low complexity, making it highly accessible to potential attackers. Organizations with internet-facing or internally accessible PLM instances are at risk.
Detection Methods for CVE-2026-21940
Indicators of Compromise
- Unusual HTTP requests to User and User Group component endpoints from unauthenticated sources
- Increased data retrieval patterns targeting PLM user or group data
- Access logs showing requests to sensitive endpoints without valid session tokens
- Network traffic anomalies involving large data responses to unauthorized clients
Detection Strategies
- Monitor HTTP access logs for requests to User and User Group component paths without authentication headers
- Implement Web Application Firewall (WAF) rules to detect and alert on suspicious access patterns to Oracle Agile PLM
- Review authentication logs for failed or missing authentication attempts followed by successful data access
- Deploy network intrusion detection signatures targeting known exploitation patterns
Monitoring Recommendations
- Enable verbose logging on Oracle Agile PLM application servers to capture all HTTP requests
- Configure SIEM alerts for unauthenticated access attempts to sensitive PLM components
- Implement real-time monitoring of data egress from PLM systems
- Regularly audit access logs for anomalous patterns indicating reconnaissance or exploitation
How to Mitigate CVE-2026-21940
Immediate Actions Required
- Apply the security patch from Oracle's January 2026 Critical Patch Update immediately
- Restrict network access to Oracle Agile PLM instances using firewall rules and network segmentation
- Implement additional authentication layers such as VPN or reverse proxy with authentication for PLM access
- Review and audit current access to identify any potential prior exploitation
Patch Information
Oracle has released a security patch addressing this vulnerability as part of the Oracle Critical Patch Update January 2026. Organizations running Oracle Agile PLM version 9.3.6 should apply this patch as the primary remediation method. The patch addresses the information disclosure vulnerability in the User and User Group component by implementing proper access controls and authentication checks.
Workarounds
- Implement network-level access controls to restrict HTTP access to Oracle Agile PLM from untrusted networks
- Deploy a reverse proxy with authentication requirements in front of the PLM application
- Enable application-level logging and monitoring to detect unauthorized access attempts
- Consider temporarily taking the system offline if immediate patching is not possible and sensitive data is at risk
# Example: Restrict network access to Oracle Agile PLM using iptables
# Allow access only from trusted internal network ranges
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
