---
id: "CVE-2026-91428"
kind: "vulnerability"
aliases: ["CVE-2026-91428"]
title: "Oracle Siebel CRM End User: Open UI flaw allows limited unauthorized data changes"
severity: "medium"
cvss: 4.3
epss: 0.00201
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["crm", "oracle-siebel", "vendor", "web-ui"]
not_affected_if: []
published_at: "2026-10-20T22:20:46+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-2026-91428", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91428", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM End User: Open UI flaw allows limited unauthorized data changes

Oracle Siebel CRM End User Open UI has a flaw that lets an unauthenticated network attacker alter some accessible data, but only when a logged-in user is tricked into a request. The sources rate it CVSS 4.3 with integrity impact only, and say supported versions 17.0 through 26.9 are affected.

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

## How to check

- Check the Siebel CRM version in use against 17.0 through 26.9 (unknown how the sources expect this to be read in your deployment)
- Review the Oracle Critical Patch Update advisory for the Siebel CRM End User patch level in use (unknown from the sources)

## Fix

- Apply the Oracle Siebel CRM patch referenced in the Oracle Critical Patch Update advisory for this CVE (unknown from the sources)

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91428
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91428

## 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 unauthenticated attacker with network access via HTTP to compromise Siebel CRM End User.  Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Siebel CRM End User accessible data. CVSS 3.1 Base Score 4.3 (Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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_