CVE-2026-47011 Overview
CVE-2026-47011 is an information disclosure vulnerability in the Oracle Siebel CRM Deployment product, specifically the Application Interface component. The flaw affects supported versions 17.0 through 26.4. A low-privileged attacker with network access over HTTP can exploit the issue to gain unauthorized read access to a subset of Siebel CRM Deployment data. Successful exploitation requires human interaction from a user other than the attacker, and the attack complexity is high. The weakness is categorized under CWE-203: Observable Discrepancy, which typically indicates a side-channel style information leak.
Critical Impact
Confidentiality-only impact limited to a subset of Siebel CRM Deployment data. No integrity or availability effects have been reported.
Affected Products
- Oracle Siebel CRM Deployment, Application Interface component
- Supported versions 17.0 through 26.4
- Deployments exposing the Siebel Application Interface over HTTP
Discovery Timeline
- 2026-07-21 - CVE-2026-47011 published to the National Vulnerability Database (NVD)
- 2026-07-23 - Last updated in NVD database
Technical Details for CVE-2026-47011
Vulnerability Analysis
The vulnerability resides in the Application Interface component of Oracle Siebel CRM Deployment. An authenticated attacker with low privileges can send crafted HTTP requests to the interface. When a separate user interacts with the affected functionality, the attacker can observe discrepancies that reveal a subset of otherwise protected data. The issue only affects confidentiality. Integrity and availability of the Siebel deployment remain intact after exploitation. The attack complexity is high, meaning exploitation depends on conditions the attacker does not fully control, such as timing, target user actions, or specific request states.
The EPSS probability is 0.164% with a percentile of approximately 6.04, indicating a low modeled likelihood of exploitation activity in the near term.
Root Cause
The root cause is mapped to CWE-203: Observable Discrepancy. The Application Interface exposes behavioral or response-level differences that vary based on protected data or backend state. An attacker can measure these differences across requests to infer information they are not authorized to read. Oracle has not published detailed root cause information beyond the advisory summary.
Attack Vector
Exploitation requires the following preconditions: network reachability to the Siebel Application Interface over HTTP, a valid low-privileged account, and interaction from a user other than the attacker. The attacker issues crafted HTTP requests and compares observable properties of the responses. The disclosed information is limited to a subset of data accessible through the deployment. There are no public proof-of-concept exploits, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
No verified exploitation code has been published. Refer to the Oracle Critical Patch Update July 2026 for authoritative technical details.
Detection Methods for CVE-2026-47011
Indicators of Compromise
- Repeated HTTP requests to Siebel Application Interface endpoints from a single low-privileged account, particularly with subtle parameter variations.
- Anomalous request-response timing patterns or high-volume probing of the same resource paths.
- Session activity correlating attacker requests with unrelated user interactions on the same deployment.
Detection Strategies
- Enable verbose HTTP access logging on the Siebel Application Interface and forward logs to a centralized analytics platform.
- Build behavioral baselines for low-privileged Siebel accounts and alert on deviations in request volume, endpoint diversity, and error rates.
- Correlate attacker session activity with concurrent user interactions to identify potential observable-discrepancy probing.
Monitoring Recommendations
- Monitor authentication events and role assignments in Siebel for unexpected low-privileged account creation or reuse.
- Track response timing and status code distributions on the Application Interface for statistical anomalies.
- Review Oracle audit logs regularly and retain HTTP telemetry long enough to support retrospective investigation.
How to Mitigate CVE-2026-47011
Immediate Actions Required
- Apply the fixes from the Oracle Critical Patch Update July 2026 to all Siebel CRM Deployment instances running versions 17.0 through 26.4.
- Inventory internet-facing Siebel Application Interface endpoints and restrict exposure to trusted networks where possible.
- Audit low-privileged Siebel accounts and remove or disable accounts that are unused or over-provisioned.
Patch Information
Oracle addressed CVE-2026-47011 in the Critical Patch Update released in July 2026. Administrators should follow the guidance in the Oracle Critical Patch Update July 2026 advisory to identify the correct patch bundle for their Siebel CRM version and apply it during the next available maintenance window. Oracle recommends staying current with CPU releases to receive fixes for previously disclosed issues.
Workarounds
- Place the Siebel Application Interface behind a reverse proxy or web application firewall that enforces strict authentication and rate limiting.
- Enforce network segmentation so that only trusted client subnets can reach the Application Interface over HTTP or HTTPS.
- Require multi-factor authentication for all Siebel users to raise the cost of acquiring the low-privileged access needed for exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
