---
id: "CVE-2026-91387"
kind: "vulnerability"
aliases: ["CVE-2026-91387"]
title: "Oracle Siebel CRM End User: Open UI flaw exposes and alters some records"
severity: "medium"
cvss: 5.4
epss: 0.00221
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise-crm", "oracle-siebel-crm", "siebel-end-user", "vendor"]
not_affected_if: ["unknown"]
published_at: "2026-10-20T22:20:41+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-2026-91387", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91387", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM End User: Open UI flaw exposes and alters some records

Oracle Siebel CRM End User has a flaw in its Open UI component that lets a low-privileged user reach the application over HTTP. A successful attacker can read a subset of accessible data and update, insert or delete some accessible data.

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

## How to check

- Confirm whether Siebel CRM End User is deployed and which release is running, as listed in the affected range `17.0` to `26.9`
- unknown

## Fix

- Apply the patch from Oracle's Siebel CRM security advisory for the affected release (version not stated in the sources)
- unknown

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91387
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91387

## From the sources

Vulnerability in the Siebel CRM End User product of Oracle Siebel CRM (component: Open UI).  Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Siebel CRM End User.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Siebel CRM End User accessible data as well as  unauthorized read access to a subset of Siebel CRM End User accessible data. CVSS 3.1 Base Score 5.4 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/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_