CVE-2026-21979: Oracle Planning Authentication Bypass Issue

CVE-2026-21979 Overview

CVE-2026-21979 is a vulnerability in the Oracle Planning and Budgeting Cloud Service product of Oracle Hyperion, specifically affecting the EPM Agent component. This easily exploitable vulnerability allows a high privileged attacker with local access to the infrastructure where Oracle Planning and Budgeting Cloud Service executes to compromise the service and gain unauthorized access to critical data or complete access to all accessible data.

Critical Impact

Successful exploitation can result in unauthorized access to critical data or complete access to all Oracle Planning and Budgeting Cloud Service accessible data. The vulnerability requires human interaction from a person other than the attacker.

Affected Products

• Oracle Planning and Budgeting Cloud Service version 25.04.07
• Oracle Hyperion EPM Agent component
• Oracle EPM Cloud environments running the affected agent version

Discovery Timeline

• January 20, 2026 - CVE-2026-21979 published to NVD
• January 20, 2026 - Last updated in NVD database

Technical Details for CVE-2026-21979

Vulnerability Analysis

This vulnerability affects the EPM Agent component within Oracle Planning and Budgeting Cloud Service, part of the Oracle Hyperion product family. The vulnerability is classified as an information disclosure flaw that can lead to unauthorized access to sensitive data.

The attack requires local access to the infrastructure where the service executes, meaning an attacker must already have some level of access to the target environment. While the attacker needs high privileges to exploit this vulnerability, the exploitation itself is considered straightforward once those prerequisites are met. Additionally, successful exploitation depends on human interaction from someone other than the attacker, which adds a social engineering component to the attack chain.

The confidentiality impact is rated as high, indicating that a successful attack could expose highly sensitive business planning and budgeting data. However, there is no impact on integrity or availability of the system, meaning attackers cannot modify data or disrupt service operations through this vulnerability alone.

Root Cause

The vulnerability stems from an access control weakness in the EPM Agent component that allows privileged users to access data beyond their intended authorization scope. When combined with specific user interactions, this flaw can be leveraged to extract sensitive planning and budgeting information from the cloud service.

Attack Vector

The attack vector for CVE-2026-21979 is local, requiring the attacker to have authenticated access to the infrastructure hosting Oracle Planning and Budgeting Cloud Service. The attack follows this general pattern:

1. The attacker must first obtain high-privilege access to the local infrastructure
2. The attacker then targets the EPM Agent component with a specific exploitation technique
3. The attack requires a victim user to perform an action (human interaction required)
4. Upon successful exploitation, the attacker gains access to critical or complete data within the service

The vulnerability does not have known active exploitation in the wild, and there are currently no public proof-of-concept exploits available. The EPSS score of 0.012% indicates a low probability of exploitation activity.

Detection Methods for CVE-2026-21979

Indicators of Compromise

• Unusual data access patterns from high-privilege accounts on EPM Agent infrastructure
• Unexpected data export or query activities targeting planning and budgeting datasets
• Anomalous local authentication events followed by bulk data access operations

Detection Strategies

• Monitor EPM Agent logs for unauthorized data access attempts by privileged users
• Implement user behavior analytics (UBA) to detect abnormal data access patterns
• Review audit logs for suspicious combinations of privileged access and data extraction activities
• Configure alerts for unusual file access or data export operations within the Hyperion environment

Monitoring Recommendations

• Enable detailed audit logging on Oracle Planning and Budgeting Cloud Service infrastructure
• Monitor for privilege escalation attempts or lateral movement targeting EPM components
• Implement data loss prevention (DLP) controls to detect unauthorized data exfiltration
• Review access control configurations and entitlements for high-privilege accounts regularly

How to Mitigate CVE-2026-21979

Immediate Actions Required

• Update the EPM Agent to the latest patched version as recommended by Oracle
• Review and restrict high-privilege account access to the EPM Agent infrastructure
• Implement additional access controls and monitoring for sensitive planning data
• Conduct a security assessment of current EPM Agent deployments to identify vulnerable installations

Patch Information

Oracle has addressed this vulnerability through a security update. Organizations should update the EPM Agent following Oracle's documented procedures. Refer to the Oracle EPM Agent Download Documentation for detailed instructions on obtaining and installing the updated agent.

Additional information is available in the Oracle Security Alert January 2026.

Workarounds

• Restrict local access to the EPM Agent infrastructure to only essential personnel
• Implement network segmentation to limit exposure of the EPM Agent component
• Enable multi-factor authentication for all high-privilege accounts accessing the infrastructure
• Implement strict least-privilege access controls for EPM Agent administration

# Configuration example
# Review and audit EPM Agent access permissions
# Ensure only authorized administrators have access to the EPM Agent infrastructure
# Example: Check current user permissions on EPM Agent directories
ls -la /path/to/epm/agent/
# Restrict file permissions to authorized users only
chmod 750 /path/to/epm/agent/
chown root:epm-admins /path/to/epm/agent/