---
id: "CVE-2026-91440"
kind: "vulnerability"
aliases: ["CVE-2026-91440"]
title: "Oracle Siebel CRM: unauthenticated HTTP flaw exposes and alters some CRM data"
severity: "medium"
cvss: 6.5
epss: 0.00255
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["http", "oracle", "self-hosted", "siebel-crm", "vendor"]
not_affected_if: ["not-siebel-crm", "unsupported-version"]
published_at: "2026-10-20T22:20:47+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-2026-91440", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91440", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM: unauthenticated HTTP flaw exposes and alters some CRM data

Oracle Siebel CRM Deployment's Server Infrastructure component has a flaw that lets an unauthenticated attacker over HTTP read a subset of accessible data and modify or delete some of it. The CVSS 3.1 score is 6.5 (medium), with confidentiality and integrity impacts and no availability impact.

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

## How to check

- Check whether Siebel CRM Deployment is in use and which version is installed, against the affected range 17.0-26.9 in the Oracle advisory.
- unknown for the exact version-check command, as the sources do not say.

## Fix

- Apply the Oracle Critical Patch Update fix for Siebel CRM Deployment; the patched version is unknown from the sources.
- Check the Oracle Security Alert or CPU advisory for the patch number.

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91440
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91440

## 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 update, insert or delete access to some of Siebel CRM Deployment accessible data as well as  unauthorized read access to a subset of Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 6.5 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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_