CVE-2026-62455: Siebel CRM Auth Bypass Vulnerability

CVE-2026-62455 Overview

CVE-2026-62455 is a high-severity access control vulnerability [CWE-284] in the Siebel Cloud Manager component of Oracle Siebel CRM Cloud Applications. Supported versions 22.3 through 26.6 are affected. The flaw allows a low-privileged attacker with network access via HTTP to compromise Siebel CRM Cloud Applications. Successful exploitation leads to unauthorized creation, deletion, or modification of critical data, unauthorized read access to a subset of data, and complete denial of service through hang or repeatable crash conditions.

Critical Impact
An authenticated low-privileged attacker can modify or destroy critical Siebel CRM data over the network and cause complete denial of service of the application.

Affected Products

Oracle Siebel CRM Cloud Applications version 22.3 through 26.6
Siebel Cloud Manager component
Oracle Siebel CRM deployments exposing HTTP interfaces

Discovery Timeline

2026-08-18 - CVE-2026-62455 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-62455

Vulnerability Analysis

The vulnerability resides in the Siebel Cloud Manager component of Oracle Siebel CRM Cloud Applications. It is classified as an improper access control weakness [CWE-284]. The flaw is exploitable over the network via HTTP with low attack complexity. An attacker only needs low-level privileges and no user interaction to trigger the condition.

The impact profile is asymmetric across the confidentiality, integrity, and availability triad. Confidentiality impact is limited to a subset of accessible data, but integrity and availability impacts are high. Attackers can create, delete, or modify all data accessible to Siebel CRM Cloud Applications. They can also induce a complete denial of service through application hangs or frequently repeatable crashes.

Root Cause

The root cause is improper access control within the Siebel Cloud Manager component. Authorization checks do not adequately restrict actions available to low-privileged authenticated users. This allows those users to perform operations that should require elevated privileges, including destructive data operations and actions that destabilize the service.

Attack Vector

Exploitation requires network access to the HTTP interface of an affected Siebel CRM Cloud Applications deployment. The attacker must hold a valid low-privileged account. From this position, the attacker issues crafted HTTP requests to the Siebel Cloud Manager endpoints that fail to enforce proper authorization. No user interaction is required. The scope remains unchanged, meaning the compromise is contained to the vulnerable component's security authority.

Verified public exploit code is not currently available. Refer to the Oracle Security Alert for vendor-provided technical context.

Detection Methods for CVE-2026-62455

Indicators of Compromise

Unexpected creation, modification, or deletion events on Siebel CRM business objects performed by non-administrative accounts
HTTP requests to Siebel Cloud Manager endpoints originating from low-privileged user sessions outside of normal workflow patterns
Repeated application crashes, hangs, or restarts of Siebel CRM Cloud Applications services correlated with specific user sessions

Detection Strategies

Enable and review Siebel audit trail logs for privileged data operations tied to accounts that should not have write access
Correlate HTTP access logs against user role assignments to identify privilege-role mismatches on Cloud Manager URIs
Baseline normal request patterns for the Siebel Cloud Manager component and alert on statistical anomalies in request volume or endpoint diversity per user

Monitoring Recommendations

Forward Siebel application, audit, and web-tier logs into a centralized SIEM for cross-source correlation
Monitor process availability and service health metrics for Siebel CRM to detect DoS conditions early
Track authentication events and session activity for low-privileged accounts accessing administrative endpoints

How to Mitigate CVE-2026-62455

Immediate Actions Required

Apply the fixes referenced in the Oracle Security Alert for affected Siebel CRM versions 22.3 through 26.6
Audit and reduce the number of accounts with access to Siebel Cloud Manager endpoints to the minimum required
Restrict network exposure of Siebel Cloud Manager HTTP interfaces to trusted management networks

Patch Information

Oracle addresses this vulnerability through its security alert program. Administrators should consult the Oracle Security Alert for the specific patch bundle, prerequisites, and version-to-patch mappings applicable to their Siebel CRM Cloud Applications deployment.

Workarounds

Place Siebel Cloud Manager behind a reverse proxy or web application firewall that enforces authenticated allowlists for administrative URIs
Enforce network segmentation so that only administrative subnets can reach Siebel Cloud Manager HTTP endpoints
Rotate credentials and revoke unused low-privileged accounts that no longer require access to the Siebel environment

bash

# Example: restrict Siebel Cloud Manager endpoints at the reverse proxy layer
# Consult vendor documentation for exact URI paths in your version
location /siebel/cloudmanager/ {
    allow 10.10.20.0/24;   # admin subnet
    deny all;
    proxy_pass http://siebel-backend;
}