---
id: "CVE-2026-91364"
kind: "vulnerability"
aliases: ["CVE-2026-91364"]
title: "Oracle Siebel CRM Cloud: adjacent-network attacker can alter and read data"
severity: "medium"
cvss: 6.8
epss: 0.00182
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise-crm", "oracle", "siebel-crm", "vendor"]
not_affected_if: ["no-shared-network-segment", "outside-affected-version-range"]
published_at: "2026-10-20T22:20:39+00:00"
first_seen_at: "2026-10-23T21:57:26+00:00"
updated_at: "2026-10-25T12:38:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91364", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91364", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Cloud: adjacent-network attacker can alter and read data

Oracle Siebel CRM Cloud Applications, versions 22.3 through 26.9, contain a flaw in the Siebel Cloud Manager component. An unauthenticated attacker on the physical communication segment attached to the hardware can create, modify, delete or read critical data in the application.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Confirm whether your deployment is a Siebel CRM Cloud Applications release in the range 22.3 to 26.9 (unknown which exact build check command applies)
- Check with Oracle's advisory for the affected component: Siebel Cloud Manager

## Fix

- Apply the Oracle Critical Patch Update fix for Siebel CRM Cloud Applications (the patched version is unknown from the sources)
- Restrict access to the network segment carrying Siebel host traffic until patched

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91364
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91364

## From the sources

Vulnerability in the Siebel CRM Cloud Applications product of Oracle Siebel CRM (component: Siebel Cloud Manager).  Supported versions that are affected are 22.3-26.9. Difficult to exploit vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the Siebel CRM Cloud Applications executes 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 access to critical data or complete access to all Siebel CRM Cloud Applications accessible data. CVSS 3.1 Base Score 6.8 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_