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Oracle Siebel CRM EUVDEUVD-2026-106696

| CVE-2026-91446 MEDIUM
Improper Privilege Management (CWE-269)
2026-10-20 secalert_us@oracle.com GHSA-rvc5-p439-7pfq
6.7
CVSS 3.1 · Vendor: oracle
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Obtain high-privileged logon to Siebel host
  2. Delivery
    Access Server Infrastructure component
  3. Exploit
    Abuse deployment flaw
  4. Execution
    Take over Siebel CRM Deployment
  5. Impact
    Full compromise of confidentiality, integrity and availability

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V8 - Authorization Least privilege enforcement
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires the attacker to already have high-privileged (administrative/operator-level) logon access to the specific host where the Siebel CRM Deployment / Server Infrastructure component executes - it is not reachable over the network and not exploitable by unauthenticated or low-privileged users. The affected feature is the Server Infrastructure component of Siebel CRM Deployment on supported versions 17.0 through 26.9. Limiting factors: local attack vector (AV:L) and PR:H mean a prior privileged foothold on the server is mandatory, no user interaction is involved (UI:N), and scope is unchanged (S:U), so the compromise is confined to the Siebel CRM Deployment itself.

Impact

This is a moderate-priority, high-CVSS-but-constrained-real-risk issue. The CVSS 3.1 vector (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, base 6.7) shows the severity is driven entirely by total technical impact (full confidentiality, integrity and availability loss - 'takeover of Siebel CRM Deployment'), while the attack feasibility is heavily gated: local attack vector (AV:L) requires the attacker to already have logon access to the host where Siebel CRM Deployment executes, and PR:H means they must already hold high/administrative privileges. In practice this means an already-privileged insider or an attacker who has first gained a privileged foothold can escalate to full compromise of the deployment component. No EPSS score, CISA KEV listing, SSVC decision data, or POC was provided in the input, so exploitation probability cannot be quantified and there is no public exploit identified at time of analysis. The signals are internally consistent (vector matches the description's 'high privileged attacker with logon'), so there is no AV:N-vs-local conflict here - the limiting factor is genuine: prior privileged local access is a hard prerequisite, which substantially lowers real-world urgency relative to the 6.7 score for internet-exposed, unauthenticated threat models.

Exploit ScenarioDerived

An attacker who already has high-privileged logon access to the server hosting Siebel CRM Deployment (for example a malicious administrator or an actor who has compromised a privileged operator account) abuses the Server Infrastructure component to take full control of the Siebel CRM Deployment, gaining complete read, modify and destroy capability. No public exploit code has been identified at time of analysis, and because the attack vector is local and requires high privileges, there is no remote or unauthenticated path.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 21, 2026

Local privilege escalation in the Server Infrastructure component of Oracle Siebel CRM Deployment (supported versions 17.0 through 26.9) lets an attacker who already holds high-privileged logon access on the deployment host take over the Siebel CRM Deployment instance, with full confidentiality, integrity, and availability impact confined to that component. The attack is local (AV:L), requires high privileges (PR:H), and needs no user interaction. No public exploit code or confirmed active exploitation was identified at time of analysis, and the CVSS 3.1 base score of 6.7 reflects a moderate-priority issue whose real-world risk is strongly constrained by the mandatory prior privileged foothold on the server.

RemediationAI

Apply the fix from Oracle's October 2026 Critical Patch Update (https://www.oracle.com/security-alerts/cpuoct2026.html); the advisory identifies the corrected release level for each supported Siebel CRM Deployment version, and because the exact patch version is not given in the supplied intelligence it should be read directly from that advisory rather than assumed. Until patching is complete, compensating controls must focus on the mandatory precondition: restrict and audit who holds high-privileged logon access to Siebel Deployment hosts, enforce least privilege and separation of duties for operator/administrator accounts, remove unnecessary local admin rights, and log privileged local sessions (trade-off: tighter account governance can slow legitimate deployment and maintenance work). Additionally, harden the deployment hosts themselves (host firewalls, EDR, restricted interactive logon rights, monitored sudo/administrative tooling) since the vector is local only, and rotate credentials for any account suspected of exposure. Monitor for unexpected changes to Siebel Deployment configuration or service state, which would indicate post-exploitation activity. No vendor workaround beyond patching is documented in the available references.

Affected VersionsENISA

Siebel CRM Deployment 17.0 ≤26.9

Affected Packages

euvd siebel_crm_deployment no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The flaw resides in Oracle Siebel CRM Deployment's Server Infrastructure component, the layer responsible for deployment/configuration services that run with elevated OS-level rights on the Siebel host. Because the CVSS vector is AV:L/AC:L/PR:H/UI:N/S:U, the weakness is only reachable from the local host, is straightforward to trigger once an operator or administrator account is present, and yields full C/I/A impact but does not cross a scope boundary in CVSS terms (remaining within the Siebel CRM Deployment context). No CWE was assigned in the available data, so the precise root-cause class (for example improper privilege or access-control handling during deployment operations) is not publicly classified; Oracle's October 2026 Critical Patch Update advisory is the authoritative source. The practical implication is that this is a post-compromise or insider-oriented escalation surface: it does not create an initial access path, but it can convert an existing highly privileged local session into complete control of the Siebel Deployment service.

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Severity by source

Vendor (oracle) PRIMARY 6.7 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 6.7 MEDIUM

Description states local logon with high privileges required (AV:L, PR:H), low complexity and no user interaction, yielding full C/I/A takeover of an unchanged-scope component.

3.1 AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows high privileged attacker with logon to the infrastructure where Siebel CRM Deployment executes to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in takeover of Siebel CRM Deployment. CVSS 3.1 Base Score 6.7 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

Threat Intelligence Overview

EPSS Score
0.1%
Top 98% exploitable
Prevalence
Medium
established enterprise CRM, common in large orgs but not ubiquitous
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

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