CVE-2026-62453: Oracle HRMS Auth Bypass Vulnerability

CVE-2026-62453 Overview

CVE-2026-62453 affects the Oracle Human Resource Management System (HRMS) UK product within Oracle E-Business Suite, specifically in the Internal Operations component. Supported versions 12.2.3 through 12.2.15 are affected. A low-privileged attacker with network access via HTTP can exploit this vulnerability to compromise Oracle HRMS (UK). Successful exploitation allows unauthorized update, insert, or delete access to a subset of accessible data, unauthorized read access to a subset of data, and the ability to cause a partial denial of service. The weakness is categorized under [CWE-200] Information Exposure.

Critical Impact
Authenticated network attackers can modify HRMS data, read sensitive subsets of HR information, and cause partial service disruption in affected Oracle E-Business Suite deployments.

Affected Products

Oracle E-Business Suite — Oracle HRMS (UK), version 12.2.3
Oracle E-Business Suite — Oracle HRMS (UK), versions 12.2.4 through 12.2.14
Oracle E-Business Suite — Oracle HRMS (UK), version 12.2.15

Discovery Timeline

2026-07-21 - CVE-2026-62453 published to the National Vulnerability Database
2026-07-22 - Last updated in the NVD database
July 2026 - Addressed in the Oracle Critical Patch Update Advisory - July 2026

Technical Details for CVE-2026-62453

Vulnerability Analysis

The flaw resides in the Internal Operations component of Oracle HRMS (UK), a module used to manage UK-specific human resources workflows within Oracle E-Business Suite. An authenticated attacker holding low-level application privileges can send crafted HTTP requests that the module fails to validate against authorization boundaries. The result is limited but broad-reaching: an attacker gains write access to a subset of HRMS data, read access to another subset, and can trigger partial service degradation.

Because HRMS stores payroll, employment, and personally identifiable information (PII) for UK-based operations, even partial unauthorized read or write access carries regulatory implications under the UK GDPR and Data Protection Act 2018. The CWE-200 classification indicates exposure of sensitive information to actors who should not have access to it.

Root Cause

Oracle has not published detailed root-cause information beyond the advisory. The [CWE-200] mapping and impact profile are consistent with insufficient authorization checks within HTTP-accessible HRMS endpoints, allowing a low-privileged session to reach data and operations reserved for higher-privileged roles.

Attack Vector

Exploitation requires network reachability to the E-Business Suite HTTP interface and valid low-privileged credentials. No user interaction is required, attack complexity is low, and the scope remains unchanged. Attackers typically chain such flaws with credential-harvesting or phishing campaigns targeting employees with basic self-service portal access. Oracle has not reported active exploitation, and no public proof-of-concept is available. The EBS Internal Operations attack surface is often exposed to internal networks and, in some deployments, to the internet through employee self-service portals, expanding the accessible population of attackers.

No verified exploit code is publicly available. Refer to the Oracle Critical Patch Update Advisory - July 2026 for vendor guidance and patch identifiers.

Detection Methods for CVE-2026-62453

Indicators of Compromise

Unexpected INSERT, UPDATE, or DELETE statements against Oracle HRMS UK schema tables originating from low-privileged application sessions.
Anomalous HTTP requests to Internal Operations endpoints from user accounts that do not normally access UK HRMS functionality.
Partial availability events or timeouts on HRMS UK services correlated with authenticated session activity.

Detection Strategies

Enable Oracle E-Business Suite Sign-On Audit and Page Access Tracking to record every access to Internal Operations pages, then correlate against expected role assignments.
Deploy database-level auditing (Oracle Unified Audit) on HRMS UK tables to flag DML operations executed outside sanctioned business workflows.
Baseline normal HTTP request patterns to the EBS front end and alert on deviations in URL paths, request volume, or session-to-endpoint mapping.

Monitoring Recommendations

Forward EBS application, Apache/OHS access, and Oracle database audit logs to a centralized analytics platform for cross-source correlation.
Monitor privileged and low-privileged user session behavior for lateral movement toward HRMS UK modules after initial authentication.
Track failed authorization events and 4xx HTTP responses on Internal Operations endpoints as early indicators of enumeration or exploitation attempts.

How to Mitigate CVE-2026-62453

Immediate Actions Required

Apply the July 2026 Oracle Critical Patch Update to all Oracle E-Business Suite instances running HRMS (UK) versions 12.2.3 through 12.2.15.
Inventory user accounts with access to Internal Operations responsibilities and remove entitlements that are not required for job function.
Restrict network exposure of the EBS HTTP tier so that only authorized corporate networks or VPN clients can reach HRMS endpoints.

Patch Information

Oracle addresses this vulnerability in the July 2026 Critical Patch Update. Administrators must review the Oracle Security Alert July 2026 bulletin for the specific patch identifiers applicable to their E-Business Suite version and apply them following Oracle's documented patching procedure, including any post-install adop steps.

Workarounds

Reduce the number of accounts holding HRMS UK responsibilities until patching is complete.
Place a web application firewall (WAF) in front of the EBS HTTP tier with rules that block anomalous requests to Internal Operations URLs.
Enable enhanced database and application auditing on HRMS UK schemas to shorten detection time if exploitation is attempted before the patch is deployed.

bash

# Example: enable Oracle Unified Audit policy for HRMS UK DML activity
sqlplus / as sysdba <<'SQL'
CREATE AUDIT POLICY hrms_uk_dml_policy
  ACTIONS INSERT ON HR.PER_ALL_PEOPLE_F,
          UPDATE ON HR.PER_ALL_PEOPLE_F,
          DELETE ON HR.PER_ALL_PEOPLE_F;

AUDIT POLICY hrms_uk_dml_policy;
SQL