CVE-2026-62593: Oracle Siebel CRM Auth Bypass Vulnerability

CVE-2026-62593 Overview

CVE-2026-62593 is a high-severity access control vulnerability in the Oracle Siebel CRM Integration product, specifically within the Open Integration component. The flaw affects supported versions 25.12 through 26.6. A low-privileged attacker with network access via HTTP can exploit this vulnerability without user interaction. Successful exploitation results in unauthorized access to critical data or complete access to all Siebel CRM Integration accessible data. The vulnerability carries a scope change, meaning attacks may significantly impact additional products beyond Siebel CRM Integration itself. Oracle disclosed the issue in the Oracle Security Alert August 2026.

Critical Impact
An authenticated attacker with low privileges can access confidential data across integrated systems via HTTP, with the scope change extending impact beyond Siebel CRM Integration.

Affected Products

Oracle Siebel CRM Integration version 25.12
Oracle Siebel CRM Integration versions 26.x through 26.6
Open Integration component of Oracle Siebel CRM

Discovery Timeline

2026-08-18 - CVE-2026-62593 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-62593

Vulnerability Analysis

The vulnerability resides in the Open Integration component of Oracle Siebel CRM Integration. It is classified under [CWE-284] Improper Access Control. Oracle's advisory indicates the flaw is easily exploitable over the network via HTTP by an attacker holding low-level credentials. Confidentiality impact is high, while integrity and availability are unaffected. The scope change indicator signals that exploitation crosses a trust boundary, allowing the attacker to reach data belonging to other integrated components. Because Siebel CRM Integration commonly connects to backend enterprise systems, the exposed data surface can extend well beyond the CRM application itself.

Root Cause

The root cause is improper access control within the Open Integration interface. Authorization checks fail to correctly restrict what data a low-privileged authenticated user can retrieve through integration endpoints. Oracle has not published implementation-level details, but the CWE-284 classification and confidentiality-only impact profile indicate that authorization logic protecting integration data is bypassed rather than authentication itself.

Attack Vector

An attacker requires network reachability to the Siebel CRM Integration HTTP interface and valid credentials at a low privilege level. The attacker then issues crafted HTTP requests to Open Integration endpoints to retrieve data they should not be authorized to view. No user interaction is required, and exploitation complexity is low. The scope change means the retrieved data can include information belonging to systems integrated with Siebel CRM, such as ERP, HR, or financial platforms.

No public proof-of-concept or exploit code is currently available for CVE-2026-62593. Refer to the Oracle Security Alert August 2026 for vendor-provided technical guidance.

Detection Methods for CVE-2026-62593

Indicators of Compromise

Unusual HTTP request volumes to Siebel CRM Open Integration endpoints from low-privileged user accounts.
Access log entries showing successful data retrieval from integration interfaces outside a user's normal business scope.
Anomalous outbound data transfers correlated with Siebel CRM Integration session activity.

Detection Strategies

Audit Siebel CRM Integration HTTP access logs for requests to Open Integration URLs that return large or cross-domain data sets.
Correlate authentication events with integration API calls to identify low-privileged accounts accessing sensitive integration data.
Baseline normal Open Integration usage per user role and alert on deviations in accessed object types or record counts.

Monitoring Recommendations

Forward Siebel CRM application, web tier, and integration logs into a centralized SIEM for correlation.
Monitor for repeated 200-OK responses on integration endpoints following privilege-mismatch conditions.
Track service account and low-privilege user behavior against role-defined baselines and generate alerts on deviation.

How to Mitigate CVE-2026-62593

Immediate Actions Required

Apply the fixes referenced in the Oracle Security Alert August 2026 to all affected Siebel CRM Integration deployments in versions 25.12 through 26.6.
Inventory all Siebel CRM Integration instances and confirm patch status against Oracle's advisory.
Review and tighten Siebel CRM user privilege assignments, removing unnecessary low-privilege accounts with integration access.
Restrict network access to Siebel CRM Integration HTTP endpoints to trusted management networks and application tiers only.

Patch Information

Oracle addressed CVE-2026-62593 in the August 2026 Security Alert. Administrators must apply the patch bundle referenced in the Oracle Security Alert August 2026 to Siebel CRM Integration versions 25.12 through 26.6. Oracle typically ships Siebel security fixes as Critical Patch Updates that require application server restart and integration component redeployment.

Workarounds

Place a reverse proxy or web application firewall in front of Siebel CRM Integration and enforce strict authorization policies on Open Integration URLs.
Disable or restrict Open Integration interfaces that are not required for business operations.
Enforce network segmentation so only authorized upstream systems can reach the Siebel CRM Integration HTTP listener.

bash

# Example: restrict access to Siebel CRM Integration HTTP endpoint via firewall
# Allow only trusted integration hosts to reach the Siebel web tier on TCP/443
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP