---
id: "CVE-2026-91377"
kind: "vulnerability"
aliases: ["CVE-2026-91377"]
title: "Oracle Siebel CRM Integration: unauthenticated HTTP flaw exposes critical data"
severity: "high"
cvss: 7.5
epss: 0.00303
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise", "oracle", "self-hosted", "siebel-crm", "vendor"]
not_affected_if: ["version-outside-25.12-26.9"]
published_at: "2026-10-20T22:20:40+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-2026-91377", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91377", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Integration: unauthenticated HTTP flaw exposes critical data

Oracle Siebel CRM Integration's Open Integration component has a flaw in versions 25.12 through 26.9 that lets an unauthenticated attacker over HTTP reach data. Successful exploitation gives unauthorized access to critical data, with high confidentiality impact and no integrity or availability impact per the CVSS vector.

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

## How to check

- Check the installed Siebel CRM Integration version against the affected range 25.12-26.9 in the Oracle Siebel deployment
- Confirm whether the Open Integration component is exposed over HTTP to the network

## Fix

- Apply the Oracle Critical Patch Update fix for Siebel CRM Integration; the exact patched version is unknown from the sources
- Restrict network access to the Open Integration HTTP endpoints until patched

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91377
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91377

## From the sources

Vulnerability in the Siebel CRM Integration product of Oracle Siebel CRM (component: Open Integration).  Supported versions that are affected are 25.12-26.9. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Integration.  Successful attacks of this vulnerability can result in  unauthorized access to critical data or complete access to all Siebel CRM Integration accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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_