---
id: "CVE-2026-91447"
kind: "vulnerability"
aliases: ["CVE-2026-91447"]
title: "Oracle Siebel CRM Deployment: unauthenticated HTTP flaw exposes critical data"
severity: "high"
cvss: 7.5
epss: 0.00377
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise-crm", "oracle", "self-hosted", "siebel-crm", "vendor"]
not_affected_if: ["unsupported-version-outside-range"]
published_at: "2026-10-20T22:20:48+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-25T12:38:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91447", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91447", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Deployment: unauthenticated HTTP flaw exposes critical data

Oracle Siebel CRM Deployment's Server Infrastructure component has a flaw reachable over HTTP without credentials. A remote attacker can gain unauthorized access to critical data or all data the deployment can reach.

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

## How to check

- Check the installed Siebel CRM Deployment version against the affected range 17.0-26.9 in the Oracle advisory.
- unknown for other checks; the sources do not name a file, setting or command.

## Fix

- Apply the Oracle Critical Patch Update fix for Siebel CRM Deployment; the exact patched version is unknown in the sources.
- Restrict HTTP access to Siebel server infrastructure endpoints until patched.

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91447
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91447

## From the sources

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 unauthenticated attacker with network access via HTTP to compromise Siebel CRM Deployment.  Successful attacks of this vulnerability can result in  unauthorized access to critical data or complete access to all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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_