What is the CVSS score of CVE-2026-46887?

CVE-2026-46887 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.5%.

Which versions of Oracle Siebel CRM are affected by CVE-2026-46887?

Oracle Siebel Apps - Marketing (versions 17.0-26.5) contains a critical vulnerability enabling unrestricted remote access and complete control of marketing systems without authentication, directly…

How to fix or mitigate CVE-2026-46887?

24 hours: Identify all systems running Oracle Siebel Apps - Marketing versions 17.0-26.5; assess internet exposure and network accessibility; contact Oracle support for emergency patch status and guidance. 7 days: Implement network segmentation to isolate affected systems from external and untrusted networks; deploy comprehensive audit logging and real-time monitoring for suspicious HTTP connections; restrict administrative access to verified personnel only. 30 days: Execute upgrade to patched version upon vendor release; if patch availability exceeds 60 days, activate contingency plan including product migration or replacement.

Oracle Siebel CRM CVE-2026-46887

EUVD-2026-37379 CRITICAL

Improper Access Control (CWE-284)

2026-06-16 oracle

Authentication Bypass Oracle Siebel Apps Marketing Oracle Corporation

9.8

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

vuln.today AI

9.8 CRITICAL

Oracle's description states unauthenticated network HTTP exploitation enabling full takeover, justifying AV:N/AC:L/PR:N/UI:N with C:H/I:H/A:H and unchanged scope.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jun 16, 2026 - 22:28 vuln.today

DescriptionCVE.org

Vulnerability in the Siebel Apps - Marketing product of Oracle Siebel CRM (component: Marketing). Supported versions that are affected are 17.0-26.5. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel Apps - Marketing. Successful attacks of this vulnerability can result in takeover of Siebel Apps - Marketing. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

AnalysisAI

Remote unauthenticated takeover of Oracle Siebel Apps - Marketing (versions 17.0 through 26.5) is achievable over HTTP, allowing attackers to fully compromise confidentiality, integrity, and availability of the Marketing component. Oracle's CVSS 9.8 rating reflects easy exploitation with no authentication or user interaction required, though no public exploit is identified at time of analysis and the CVE is not currently listed in CISA KEV.

Technical ContextAI

The vulnerability resides in the Marketing component of Oracle Siebel CRM's Siebel Apps - Marketing product, an enterprise customer relationship management suite widely deployed in financial services, telecommunications, and public sector environments. The affected CPE is cpe:2.3:a:oracle_corporation:siebel_apps_-_marketing covering all releases from 17.0 up to and including 26.5. Although the CWE is not specified, the combination of network-based HTTP attack vector, no privileges required, and full CIA impact is characteristic of authentication bypass, deserialization, or injection flaws commonly seen in Java-based Oracle web applications. Oracle has not publicly disclosed the root cause class, which is consistent with their standard Critical Patch Update disclosure practice.

RemediationAI

Apply the Oracle Critical Patch Update from June 2026 as documented at https://www.oracle.com/security-alerts/cspujun2026.html - Patch available per vendor advisory, though Oracle does not publish a single resolved version since CPU patches apply across the supported 17.0-26.5 range. Until patching is complete, restrict network access to the Siebel Marketing web tier by placing it behind a VPN or zero-trust proxy that enforces authentication before HTTP requests reach the application, accepting the trade-off that external marketing campaign management workflows may break. Web application firewall rules blocking anomalous Marketing component endpoints can serve as a secondary control, though without root-cause disclosure these rules will be best-effort pattern matching rather than precise mitigations. Inventory all Siebel Marketing instances including non-production environments, as Oracle CPU vulnerabilities are frequently reverse-engineered from the patch diff within weeks of release.