CVE-2026-62456

Executive Summary

Business Impact: This vulnerability affects Oracle E-Business Suite, a critical enterprise resource planning (ERP) platform used extensively in finance, manufacturing, healthcare, and government sectors. The Oracle HRMS (UK) module specifically handles sensitive human resources data, including personally identifiable information (PII), payroll details, and organizational structures. A successful attack could lead to the unauthorized modification or exfiltration of this critical data, resulting in severe regulatory penalties (GDPR, UK DPA 2018), operational disruption, and reputational damage. The likely attacker is a low-privileged insider or an external threat actor who has already gained initial access to the network, seeking to escalate privileges and pivot to other systems.

Vulnerability Class & Attack Vector: This is an Improper Access Control vulnerability (CWE-284) within the Internal Operations component of Oracle HRMS (UK). The attack vector is network-based via HTTPS, requiring low privileges and user interaction. The vulnerability is considered difficult to exploit due to the high attack complexity (AC:H).

Urgency Assessment: Despite a CVSS base score of 8.2 (High), the urgency is tempered by the high attack complexity and the current EPSS probability of 0.0%, indicating no known active exploitation in the wild. However, the potential for significant data compromise and the scope change (impacting other products) warrants immediate attention for patching as part of a standard vulnerability management cycle. Organizations should prioritize this for remediation within their standard patch window.

Key Facts:

• Vendor: Oracle
• Affected Product: Oracle E-Business Suite, Oracle HRMS (UK) module
• Affected Versions: 12.2.3 through 12.2.15
• Patch Status: None available as of 2026-07-22. See vendor advisory.
• CISA KEV: Not listed.

CVSS Breakdown & Threat Level

Qualitative Severity: High

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS Interpretation: The EPSS score of 0.0% indicates that as of 2026-07-22, there is no evidence of exploitation in the wild. This is common for newly published vulnerabilities. The score is expected to change as threat actors analyze the vulnerability and develop exploits.

Historical Comparison: This vulnerability is similar in nature to other Oracle E-Business Suite access control flaws, such as CVE-2022-21587 (CVSS 9.8, but unauthenticated) and CVE-2023-21912 (CVSS 8.2, low-privileged with scope change). These CVEs highlight a recurring pattern of complex, privilege-escalation vulnerabilities within Oracle's ERP suite that require careful input validation and access control review.

Temporal & Environmental Considerations: The lack of a patch and no known exploit currently results in a high temporal score. Organizations with a high dependency on Oracle HRMS (UK) for sensitive data processing should consider the environmental score as critical, potentially raising the overall risk assessment.

Technical Deep Dive & Attack Mechanics

Root Cause Analysis: The vulnerability is an Improper Access Control (CWE-284) flaw within the "Internal Operations" component of the Oracle HRMS (UK) module. This suggests that the application fails to properly enforce authorization checks on specific internal API calls or function invocations. A low-privileged user can craft a request that bypasses the intended access controls, allowing them to perform operations reserved for higher-privileged roles (e.g., HR Manager, System Administrator).

Step-by-Step Attack Mechanics:

1. Authentication: The attacker authenticates to the Oracle E-Business Suite web interface using a valid low-privileged account (e.g., a standard employee or a junior HR assistant).
2. Reconnaissance: The attacker identifies the specific internal API endpoints or function calls used by the HRMS (UK) module for administrative operations. This could involve analyzing client-side JavaScript, network traffic, or documentation.
3. Crafting the Exploit: The attacker crafts a malicious HTTP/HTTPS request to one of these internal endpoints. The request includes parameters that the server-side code does not properly validate against the user's session privileges. For example, the request might attempt to modify a user's role, access another employee's salary record, or create a new user account.
4. Bypassing Access Controls: Due to the missing or flawed authorization check, the server processes the request as if it came from a privileged user. The high attack complexity (AC:H) suggests this bypass might require specific conditions, such as a race condition, a specific sequence of requests, or manipulation of session state.
5. Data Compromise: The attacker successfully reads or modifies sensitive HR data. Due to the scope change (S:C), the attacker may also be able to leverage this access to compromise other integrated Oracle E-Business Suite modules (e.g., Financials, Payroll).

Attack Surface:

• Protocol: HTTPS (TCP/443)
• Interface: Oracle E-Business Suite web application, specifically the Oracle HRMS (UK) module's internal API endpoints.
• Pre-conditions:
  • Valid low-privileged user credentials for the target Oracle E-Business Suite instance.
  • Network access to the application's web interface.
  • The target instance must be running a vulnerable version (12.2.3 - 12.2.15).

Why Standard Defenses May Fail:

• WAF Bypass: The attack uses legitimate HTTPS traffic and valid session cookies. A Web Application Firewall (WAF) may not detect the malicious intent if it only looks for common injection patterns (SQLi, XSS) and not for business logic abuse.
• Authentication Bypass vs. Authorization Bypass: Standard defenses often focus on preventing unauthenticated access. This vulnerability is an authorization bypass, meaning the attacker is already authenticated, making it harder to distinguish from legitimate user activity.

Vulnerable vs. Patched Code Analysis

Note: No patch or code diff is available. The following is a hypothetical analysis based on the vulnerability description.

Vulnerable Code (Hypothetical Pseudocode):

// Vulnerable function in InternalOperations.java
function updateEmployeeSalary(request, userSession) {
    // Missing or flawed authorization check
    // if (!isAuthorized(userSession, "HR_MANAGER")) { return error; }

    employeeId = request.getParameter("employeeId");
    newSalary = request.getParameter("salary");

    // Directly updates the database without verifying the user's right to modify this specific record
    database.execute("UPDATE employees SET salary = ? WHERE id = ?", newSalary, employeeId);
    return success;
}

Patched Code (Hypothetical):

// Patched function in InternalOperations.java
function updateEmployeeSalary(request, userSession) {
    // Proper authorization check
    if (!isAuthorized(userSession, "HR_MANAGER")) {
        logSecurityEvent("Unauthorized salary update attempt by user: " + userSession.getUserId());
        return error("Insufficient privileges.");
    }

    employeeId = request.getParameter("employeeId");
    newSalary = request.getParameter("salary");

    // Additional check: verify the user is authorized for this specific employee (e.g., their department)
    if (!isAuthorizedForEmployee(userSession, employeeId)) {
        logSecurityEvent("Unauthorized access to employee record: " + employeeId);
        return error("Access denied.");
    }

    database.execute("UPDATE employees SET salary = ? WHERE id = ?", newSalary, employeeId);
    return success;
}

Analysis: The patch introduces a robust authorization check (isAuthorized) before any sensitive operation. It also adds a granular check (isAuthorizedForEmployee) to prevent horizontal privilege escalation. The fix is sufficient if implemented correctly across all internal operations.

Regression Considerations: Teams applying the patch must ensure that the new authorization checks do not break legitimate workflows for authorized users. Thorough testing of all HRMS (UK) business processes is required.

Timeline & Disclosure History

• CVE Publication Date: 2026-07-21T21:39:29.519Z
• Estimated Discovery: The vulnerability was likely discovered and reported to Oracle prior to the publication date, following responsible disclosure practices.
• Disclosure Process: The CVE was published by the CVE Program, with Oracle as the CNA (CVE Numbering Authority) for this product.
• Known Exploitation in the Wild: No known active exploitation as of 2026-07-22.
• CISA KEV: Not listed.

Threat Intelligence Context

Threat Actor Profile: This vulnerability is most likely to be exploited by:

• Insider Threats: A disgruntled or malicious employee with low-level access seeking to exfiltrate data or sabotage HR records.
• Nation-State Actors: APT groups targeting government or defense contractor HR systems for intelligence gathering.
• Ransomware Operators: While the CVSS has no availability impact, ransomware groups could use this to gain a foothold and then deploy ransomware. The data access could also be used for extortion.

Attack Campaign Context: No specific campaigns are associated with this CVE at this time.

Geographic Targeting: Organizations in the United Kingdom are most at risk due to the specific "UK" localization of the affected module, though any global deployment of Oracle HRMS (UK) is vulnerable.

Industry Verticals Most at Risk:

• Government (Central & Local UK)
• Healthcare (NHS Trusts)
• Financial Services
• Higher Education
• Large Enterprises with UK-based HR operations

Exploitation & Lab Setup

Red Team Section

Lab Setup:

1. Environment: A virtualized environment (VMware, VirtualBox) with a target machine running Oracle E-Business Suite 12.2.3 (or any version in the 12.2.3-12.2.15 range) with the HRMS (UK) module installed.
2. Attacker Machine: A Kali Linux or Parrot OS VM.
3. Network: A host-only or internal network connecting the attacker and target machines.
4. Credentials: Create a low-privileged user account (e.g., user1/password123) on the Oracle E-Business Suite instance.

Prerequisites:

• Oracle E-Business Suite 12.2.3-12.2.15 with HRMS (UK) module.
• Low-privileged user credentials.
• Network connectivity to the target's HTTPS port (443).

Exploitation Walkthrough (Hypothetical):

1. Login: Use a tool like Burp Suite or a Python script to authenticate as the low-privileged user and obtain a valid session cookie.

   # Example using curl (hypothetical)
   curl -k -c cookies.txt -X POST https://target.oracle.com/OA_HTML/AppsLogin \
     -d "username=user1&password=password123"
   

2. Identify Endpoint: Analyze the web application's traffic to find an internal API endpoint, e.g., /OA_HTML/HRMSInternalOp.
3. Craft Malicious Request: Send a crafted POST request to the endpoint with parameters that should be restricted to administrators.

   # Hypothetical exploit request
   curl -k -b cookies.txt -X POST https://target.oracle.com/OA_HTML/HRMSInternalOp \
     -d "operation=updateUserRole&targetUserId=admin&newRole=HR_MANAGER"
   

4. Verify Exploitation: If successful, the attacker's session or the target user's role will be escalated. The attacker can then access sensitive data or perform administrative functions.

Expected Output: The server returns a success response (HTTP 200) and the attacker gains unauthorized access to critical data or administrative functions.

Post-Exploitation: The attacker can now:

• Exfiltrate all employee PII and salary data.
• Modify payroll records.
• Create new privileged accounts for persistent access.
• Pivot to other connected Oracle E-Business Suite modules.

Blue Team Section

Detection:

• Log Analysis: Monitor Oracle E-Business Suite audit logs for unusual API calls from low-privileged users, especially to the InternalOperations component.
• Network Traffic: Look for anomalous HTTP request patterns, such as a high volume of POST requests to internal API endpoints from a single user account.
• Endpoint Indicators: Monitor for unexpected changes to user roles, creation of new accounts, or access to sensitive HR data by users who do not normally require it.

Indicators of Compromise (IOCs)

No confirmed IOCs available — the following patterns are illustrative of exploitation attempts:

Detection Engineering

YARA Rule

rule CVE-2026-62456_Oracle_HRMS_Exploit {
    meta:
        description = "Detects HTTP requests targeting the Oracle HRMS Internal Operations component"
        author = "Valters IT Hub"
        date = "2026-07-22"
        reference = "https://www.valtersit.com/cve/cve-2026-62456"
    strings:
        $s1 = "/OA_HTML/HRMSInternalOp" ascii wide nocase
        $s2 = "operation=updateUserRole" ascii wide nocase
        $s3 = "operation=createUser" ascii wide nocase
    condition:
        any of ($s1, $s2, $s3)
}

Sigma Rule (SIEM)

title: CVE-2026-62456 Oracle HRMS Internal Operations Exploitation
id: 6736de70-a79f-4cf4-8650-2cba034f3bf3
status: experimental
description: Detects exploitation attempts targeting CVE-2026-62456 in Oracle HRMS (UK)
author: Valters IT Hub
date: 2026-07-22
references:
    - https://www.valtersit.com/cve/cve-2026-62456
logsource:
    category: webserver
    product: oracle
    service: ebs
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/OA_HTML/HRMSInternalOp'
        cs-uri-query|contains:
            - 'operation=updateUserRole'
            - 'operation=createUser'
            - 'operation=deleteUser'
    condition: selection
falsepositives:
    - Legitimate administrative activity from authorized HR managers
level: high

Suricata IDS Rule

alert http $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (
    msg:"CVE-2026-62456 - Oracle HRMS Internal Operations Exploitation Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/OA_HTML/HRMSInternalOp"; http_uri;
    content:"operation=updateUserRole"; http_client_body;
    classtype:attempted-admin;
    sid:10000001;
    rev:1;
)

Elastic (EQL) Query

// Elastic EQL query for detecting exploitation attempts
network where process.name == "httpd" and
  network.protocol == "http" and
  http.request.method == "POST" and
  http.request.uri == "/OA_HTML/HRMSInternalOp" and
  http.request.body.text contains "operation=updateUserRole"

Splunk SPL Query

index=oracle_ebs sourcetype=access_combined
| search method=POST uri_path="/OA_HTML/HRMSInternalOp"
| search uri_query=*operation=updateUserRole*
| table _time, clientip, user, uri_query, status
| sort - _time

Wazuh Rule

<group name="oracle_ebs,">
  <rule id="100001" level="12">
    <decoded_as>json</decoded_as>
    <field name="method">POST</field>
    <field name="uri">/OA_HTML/HRMSInternalOp</field>
    <field name="request_body">\.*operation=updateUserRole\.*</field>
    <description>CVE-2026-62456 - Oracle HRMS Internal Operations Exploitation Attempt</description>
    <mitre>
      <id>T1190</id>
    </mitre>
  </rule>
</group>

Remediation & Mitigation

Immediate Actions (0-24 hours)

• Patch: No patch is available. Monitor Oracle's security advisory page for the upcoming Critical Patch Update (CPU).
• Compensating Controls:
  • Network Segmentation: Restrict network access to the Oracle E-Business Suite web interface to only authorized users and systems via VPN or bastion hosts.
  • WAF Rules: Deploy a temporary WAF rule to block POST requests to /OA_HTML/HRMSInternalOp from non-administrative IP ranges.
  • Access Control Hardening: Review and revoke unnecessary low-privileged accounts. Enforce multi-factor authentication (MFA) for all users.

Short-term (1-7 days)

• Configuration Hardening: Review and tighten authorization policies within Oracle HRMS (UK). Ensure the principle of least privilege is strictly enforced.
• Monitoring Implementation: Implement the detection rules provided in this report (Sigma, Suricata, Splunk) to monitor for exploitation attempts.
• Vulnerability Scanning: Use a vulnerability scanner (e.g., Nessus, Qualys) with an updated plugin to confirm the presence of CVE-2026-62456 on your Oracle E-Business Suite instances.

Long-term

• Architecture Changes: Consider isolating the Oracle HRMS (UK) module from other E-Business Suite components to limit the scope of a potential breach.
• Security Control Improvements: Implement a robust Identity and Access Management (IAM) solution with continuous monitoring for privilege escalation.
• Developer Training: Emphasize secure coding practices, particularly around authorization checks and the principle of least privilege, for all Oracle E-Business Suite developers.

Validation: To confirm the patch is applied, check the Oracle E-Business Suite version number after applying the next Critical Patch Update. The version should be outside the 12.2.3-12.2.15 range. Run a vulnerability scan to confirm the CVE is no longer detected.

References & Resources

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-62456
• CVE.org: https://www.cve.org/CVERecord?id=CVE-2026-62456
• Vendor advisory: See Oracle Critical Patch Update Advisory
• OSV: https://osv.dev/vulnerability/CVE-2026-62456
• Related CWE: https://cwe.mitre.org/data/definitions/284.html
• MITRE ATT&CK: https://attack.mitre.org/techniques/T1190/

Report generated by Valters IT Hub Neural Engine v25 | 2026-07-22 | https://www.valtersit.com/cve/cve-2026-62456