---
id: "CVE-2026-91450"
kind: "vulnerability"
aliases: ["CVE-2026-91450"]
title: "Oracle Siebel CRM: unauthenticated network flaw exposes and changes CRM data"
severity: "high"
cvss: 7.4
epss: 0.00302
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["crm", "oracle-siebel", "self-hosted", "vendor"]
not_affected_if: ["no-network-exposure", "unaffected-version"]
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-2026-91450", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91450", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

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

Oracle Siebel CRM Deployment versions 17.0 through 26.9 contain a flaw in the Server Infrastructure component that can be reached over HTTP. A remote attacker with no account can read, create, modify or delete critical CRM data, though the attack is hard to carry out.

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

## How to check

- Confirm the Siebel CRM Deployment version in use against the affected range 17.0-26.9 in the Oracle advisory.
- unknown for further host-level checks; the sources do not say.

## Fix

- Apply the Oracle Siebel CRM Deployment patch from the Oracle Critical Patch Update that covers this CVE; the exact patched version is unknown from the sources.

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91450
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91450

## 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_