---
id: "CVE-2026-101391"
kind: "vulnerability"
aliases: ["CVE-2026-101391"]
title: "Oracle Siebel CRM Marketing: unauthenticated HTTP flaw exposes and alters some data"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise-crm", "http", "oracle-crm", "siebel", "vendor"]
not_affected_if: ["not-running-siebel-marketing", "outside-affected-versions"]
published_at: "2026-10-20T22:17:46+00:00"
first_seen_at: "2026-10-23T21:57:21+00:00"
updated_at: "2026-10-25T04:03:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101391", "first_seen_at": "2026-10-23T21:57:21+00:00"}]
---

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

An unauthenticated attacker over HTTP can read and modify a subset of data in Siebel Apps - Marketing, but only after a person other than the attacker takes an action. The flaw also has a scope change, so it may affect other products beyond Siebel Marketing.

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

## How to check

- Confirm whether Oracle Siebel CRM Marketing is in use and which release it runs, against the affected range 17.0-26.9 given in the source
- Check the release with the Oracle Siebel patch documentation for your installed version (unknown exact command)

## Fix

- Apply the Oracle Critical Patch Update fix for Siebel Apps - Marketing that covers releases 17.0-26.9 (exact patch version unknown from sources)
- Follow Oracle's advisory for the fixed release number (unknown from sources)

## Timeline

- 2026-10-23T21:57:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-101391

## From the sources

Vulnerability in the Siebel Apps - Marketing product of Oracle Siebel CRM (component: Marketing).  Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel Apps - Marketing.  Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Siebel Apps - Marketing, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Siebel Apps - Marketing accessible data as well as  unauthorized read access to a subset of Siebel Apps - Marketing accessible data. CVSS 3.1 Base Score 6.1 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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_