CVE-2026-62603: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-62603 Overview

CVE-2026-62603 is a security vulnerability in the Oracle Hyperion Calculation Manager product, part of the Oracle Hyperion suite. The flaw resides in the Security component and affects supported version 11.2.25.0.000. An unauthenticated attacker with access to the physical communication segment attached to the hardware running Oracle Hyperion Calculation Manager can exploit the issue over an adjacent network. Successful exploitation allows unauthorized update, insert, or delete operations against a subset of Calculation Manager data, along with unauthorized read access to a subset of accessible data.

Critical Impact
Adjacent-network attackers without credentials can modify and read a subset of Oracle Hyperion Calculation Manager data, undermining the integrity and confidentiality of financial planning workloads.

Affected Products

Oracle Hyperion Calculation Manager 11.2.25.0.000
Oracle Hyperion (Security component)
Deployments exposing Calculation Manager to shared or adjacent network segments

Discovery Timeline

2026-08-18 - CVE-2026-62603 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-62603

Vulnerability Analysis

The vulnerability is located in the Security component of Oracle Hyperion Calculation Manager. Oracle classifies exploitation as easy and requires no authentication or user interaction. The attack must originate from the adjacent network segment attached to the hardware where Calculation Manager runs, which limits remote exposure but does not require credentials. Successful exploitation yields partial confidentiality and integrity impact against Calculation Manager data, but no direct availability impact. The vulnerability affects financial planning environments where Calculation Manager coordinates business rule logic and calculation scripts.

Root Cause

Oracle's advisory attributes the flaw to the Security component of Calculation Manager but does not publish deeper technical detail. The exposure requires no privileges, indicating a missing or improper authentication or access control check on network-reachable functionality. Because the attack vector is adjacent (AV:A), the affected interface is exposed at Layer 2 or on a shared broadcast domain rather than the full public network.

Attack Vector

An attacker on the same physical or logical network segment as the Calculation Manager host initiates requests against the exposed service without providing credentials. The attacker can then perform unauthorized read operations on a subset of data and write, modify, or delete records within Calculation Manager's data scope. No user interaction is required, and no privilege escalation on the underlying host is described. Refer to the Oracle Security Alert for vendor-supplied technical context.

No public proof-of-concept exploit is available at the time of publication, and the EPSS probability is 0.228%.

Detection Methods for CVE-2026-62603

Indicators of Compromise

Unexpected modifications, insertions, or deletions in Oracle Hyperion Calculation Manager business rule or calculation script repositories
Anonymous or unauthenticated connections to Calculation Manager service ports from adjacent network hosts
Application logs showing data-access events without an associated authenticated user session

Detection Strategies

Enable verbose application and access logging on Calculation Manager and forward events to a central SIEM for correlation
Baseline normal read/write activity against Calculation Manager objects and alert on deviations from that baseline
Monitor for network flows to Calculation Manager service ports originating from hosts outside the approved administrative segment

Monitoring Recommendations

Ingest Oracle Hyperion audit logs and network telemetry into a unified data lake for cross-source correlation
Alert on configuration changes to Calculation Manager rules and objects made outside approved change windows
Review Active Directory and Hyperion Shared Services authentication logs for anomalous session activity adjacent to Calculation Manager hosts

How to Mitigate CVE-2026-62603

Immediate Actions Required

Apply the security update referenced in the Oracle Security Alert for the August 2026 cycle
Inventory all Oracle Hyperion Calculation Manager 11.2.25.0.000 deployments and prioritize patching internet-adjacent instances
Restrict network reachability of Calculation Manager services to authorized administrative segments only

Patch Information

Oracle has published patch guidance in the August 2026 Critical Patch Update advisory. Administrators should follow the vendor-recommended upgrade path for Oracle Hyperion Calculation Manager 11.2.25.0.000 as described in the Oracle Security Alert. Apply the update in a maintenance window and validate calculation script and business rule integrity after installation.

Workarounds

Segment the network so Calculation Manager hosts reside on an isolated VLAN accessible only to trusted administrative systems
Enforce host-based firewall rules that restrict inbound connections to Calculation Manager service ports
Increase audit logging retention on Calculation Manager and Hyperion Shared Services until patching is complete

bash

# Example: restrict inbound access to Calculation Manager service port using iptables
# Replace <admin_subnet> and <calcmgr_port> with environment-specific values
iptables -A INPUT -p tcp --dport <calcmgr_port> -s <admin_subnet> -j ACCEPT
iptables -A INPUT -p tcp --dport <calcmgr_port> -j DROP