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CVE-2026-46920 is a high‑severity vulnerability affecting the Siebel CRM Cloud Applications product of Oracle Siebel CRM, specifically within the Siebel Cloud Manager component. The flaw stems from improper access control (CWE‑284) and missing authentication for critical functions (CWE‑306), which together allow an unauthenticated, remote attacker to compromise the entire cloud application instance.
The vulnerability is present in all supported Siebel Cloud Manager versions from 17.0 through 26.5 inclusive. It is exposed over the network via the HTTP protocol, meaning that no physical or local access is required. The attack complexity is rated as High because the attacker must overcome certain unspecified obstacles – likely involving request crafting, session manipulation, or bypassing of initial validation checks – to successfully trigger the flaw.
Once exploited, the attacker gains the ability to completely take over the Siebel CRM Cloud Applications environment. This includes full read access to sensitive customer and business data, the capability to modify or delete critical records and configuration settings, and the power to disrupt service availability, leading to a denial‑of‑service condition. The impact is uniformly High across all three security pillars: Confidentiality, Integrity, and Availability.
The CVSS 3.1 base score is 8.1 (High), with the vector string:
`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`.
This reflects a network‑accessible attack (AV:N), high attack complexity (AC:H), no required privileges (PR:N), no user interaction (UI:N), an unchanged scope (S:U), and high impacts on all three security properties.
Oracle published a security advisory as part of its June 2026 Critical Patch Update (CPU) , which includes a fix for this vulnerability. Administrators are strongly urged to apply the patch immediately, as no public proof‑of‑concept has been disclosed, but the unauthenticated nature and full takeover potential make this a prime target for threat actors.
Given the high complexity, exploitation is not trivial, but successful attacks would result in a complete breach of the Siebel CRM Cloud environment, potentially affecting thousands of enterprise customers. The vulnerability is considered High severity and should be prioritised in any patching cycle.
DailyCVE Form:
Platform: Oracle Siebel CRM
Version: 17.0‑26.5
Vulnerability: Improper Access Control
Severity: High (8.1 CVSS)
date: 2026‑06‑17
Prediction: Patched June 2026 CPU
What Undercode Say:
Analytics
- CVSS 3.1 Base Score: 8.1 (High)
- Attack Vector: Network (AV:N)
- Attack Complexity: High (AC:H)
- Privileges Required: None (PR:N)
- User Interaction: None (UI:N)
- Scope: Unchanged (S:U)
- Confidentiality Impact: High (C:H)
- Integrity Impact: High (I:H)
- Availability Impact: High (A:H)
- CWE IDs: CWE‑284 (Improper Access Control), CWE‑306 (Missing Authentication for Critical Function)
- EPSS: 0.38% (as of 2026‑06‑17)
- Patch Availability: Yes (Oracle CPU June 2026)
Bash Commands & Codes
Check Siebel Cloud Manager version (example – adjust path) cat /opt/oracle/siebel/cloud_manager/version.txt Verify if the June 2026 CPU patch is applied opatch lsinventory | grep -i "june 2026" Query the Siebel repository for the fix (if using Oracle Linux) rpm -qa | grep -i siebel-cloud-manager Optional: Use curl to test for insecure endpoint (DO NOT USE IN PRODUCTION) curl -k -X GET "https://<siebel-host>/cloud-manager/api/v1/status" -H "User-Agent: CVE-2026-46920"
Exploit:
No public exploit code is available. However, an unauthenticated attacker can send crafted HTTP requests to the Siebel Cloud Manager API endpoints that lack proper authentication checks. By manipulating the request parameters or using a sequence of calls that bypass access control logic, the attacker can gain administrative privileges over the cloud management plane. The high attack complexity suggests that the exploitation requires knowledge of internal API structures and possibly timing or state‑based conditions, but once successful, full takeover is achieved.
Protection from this CVE:
- Apply the Oracle June 2026 Critical Patch Update (CPU) immediately to all affected Siebel Cloud Manager instances (versions 17.0‑26.5).
- If patching is not possible, restrict network access to the Siebel Cloud Manager component using firewall rules or network segmentation, allowing only trusted IP ranges.
- Monitor HTTP access logs for anomalous requests targeting `/cloud-manager/` endpoints.
- Implement Web Application Firewall (WAF) rules to block suspicious patterns or known attack signatures as they become available.
- Regularly review and audit user roles and permissions within the Siebel environment to detect any unauthorised changes.
Impact:
Successful exploitation leads to complete takeover of the Siebel CRM Cloud Applications, allowing an attacker to:
– Read, exfiltrate, or destroy sensitive customer data, financial records, and business intelligence.
– Modify or delete system configurations, potentially causing widespread service disruption.
– Impersonate legitimate administrators and perform arbitrary actions within the cloud environment.
– Use the compromised instance as a pivot point to attack internal networks or other connected Oracle services.
– The high CVSS score of 8.1 underscores the criticality of this vulnerability, and organisations running affected versions should treat this as a top‑priority security update.
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Sources:
Reported By: nvd.nist.gov
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