---
id: "CVE-2026-91449"
kind: "vulnerability"
aliases: ["CVE-2026-91449"]
title: "Oracle Siebel CRM: unauthenticated HTTP flaw exposes and changes CRM data"
severity: "high"
cvss: 7.4
epss: 0.00244
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["oracle", "self-hosted", "siebel-crm", "vendor"]
not_affected_if: ["versions-outside-17.0-26.9"]
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-2026-91449", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91449", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM: unauthenticated HTTP flaw exposes and changes CRM data

Oracle Siebel CRM Deployment's Server Infrastructure component, versions 17.0 through 26.9, has a flaw that an unauthenticated attacker can reach over the network via HTTP. Successful exploitation lets the attacker create, modify, delete or read critical and all Siebel-accessible data.

_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 to 26.9 in the Oracle advisory
- Confirm whether the Server Infrastructure component is reachable over HTTP from untrusted networks, which the sources do not specify further

## Fix

- Apply the Oracle Critical Patch Update fix for Siebel CRM Deployment, version to move to: unknown
- Check the Oracle Critical Patch Update advisory for the patched version: unknown

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91449
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91449

## 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. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Deployment.  Successful attacks of this vulnerability can result in  unauthorized creation, deletion or modification access to critical data or all Siebel CRM Deployment accessible data as well as  unauthorized access to critical data or complete access to all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 7.4 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

---

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