What is the CVSS score of CVE-2026-62455?

CVE-2026-62455 has a CVSS 3.1 base score of 8.3 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H. EPSS exploitation probability: 0.4%.

Which versions of Oracle Siebel CRM are affected by CVE-2026-62455?

Oracle Siebel CRM Cloud (versions 22.3-26.6) contains an authentication-required vulnerability enabling attackers to alter customer data, disrupt service, and access sensitive information.

How to fix or mitigate CVE-2026-62455?

Within 24 hours: Identify all Siebel Cloud Manager instances running versions 22.3-26.6 and catalog their criticality level and data sensitivity. Within 7 days: Restrict network access to the Siebel Cloud Manager component through firewall rules or network segmentation, reducing exposed attack surface; implement enhanced logging for CRM data modifications and service disruptions; conduct a complete access review to minimize low-privileged user accounts with administrative capabilities. Within 30 days: Coordinate with Oracle support to identify patched or unaffected Siebel versions and develop upgrade plan for all affected instances; deploy Web Application Firewall (WAF) rules targeting Siebel Cloud Manager endpoints; implement periodic penetration testing focused on authentication bypass or privilege escalation vectors.

Oracle Siebel CRM CVE-2026-62455

EUVD-2026-61500 HIGH

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-cgpf-mrh9-xhpw

Authentication Bypass Oracle Siebel Crm

8.3

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

8.3 HIGH

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

vuln.today AI

8.3 HIGH

Network HTTP access with low privileges and no user interaction; high integrity and availability impact matches data manipulation and crash capability; partial confidentiality aligns with subset read access described.

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

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Aug 19, 2026 - 03:37 vuln.today

CVE Published

Aug 18, 2026 - 21:17 nvd

HIGH 8.3

DescriptionCVE.org

Vulnerability in the Siebel CRM Cloud Applications product of Oracle Siebel CRM (component: Siebel Cloud Manager). Supported versions that are affected are 22.3-26.6. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Siebel CRM Cloud Applications. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Siebel CRM Cloud Applications accessible data as well as unauthorized read access to a subset of Siebel CRM Cloud Applications accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Siebel CRM Cloud Applications. CVSS 3.1 Base Score 8.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H).

AnalysisAI

Compromise of Oracle Siebel CRM Cloud Applications (versions 22.3-26.6) is achievable by a low-privileged, network-authenticated attacker over HTTP targeting the Siebel Cloud Manager component. Successful exploitation yields unauthorized creation, deletion, or modification of critical CRM data (high integrity impact), partial unauthorized read of CRM data (low confidentiality impact), and the ability to cause a complete, repeatable denial-of-service crash of the application. …

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Vulnerability AssessmentAI

Exploitation	Exploitation requires a valid low-privilege authenticated account on the Siebel CRM Cloud Applications instance (CVSS PR:L) and network access to the Siebel Cloud Manager HTTP interface (CVSS AV:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 3.1 base score of 8.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H) indicates an easily exploitable, network-reachable flaw requiring only low privileges - any authenticated user account suffices. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation	Apply the Oracle Critical Security Patch Update for August 2026, available via the Oracle advisory at https://www.oracle.com/security-alerts/cspuaug2026.html. … Detailed patch versions, workarounds, and compensating controls in full report.