---
id: "CVE-2026-91240"
kind: "vulnerability"
aliases: ["CVE-2026-91240"]
title: "Oracle WebCenter Sites: unauthenticated HTTP flaw exposes critical data"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["fusion-middleware", "oracle", "self-hosted", "vendor", "webcenter-sites"]
not_affected_if: ["no-internet-exposure", "other-versions"]
published_at: "2026-10-20T22:20:24+00:00"
first_seen_at: "2026-10-23T21:57:26+00:00"
updated_at: "2026-10-25T04:08:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91240", "first_seen_at": "2026-10-23T21:57:26+00:00"}]
---

# Oracle WebCenter Sites: unauthenticated HTTP flaw exposes critical data

Oracle WebCenter Sites 12.2.1.4.0 and 14.1.2.0.0 contain a flaw that an unauthenticated remote attacker can reach over HTTP. A successful attack can read critical data stored in the product, with no integrity or availability impact listed.

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

## How to check

- Check the installed WebCenter Sites version against `12.2.1.4.0` and `14.1.2.0.0`
- Review the Oracle Critical Patch Update advisory for the exact patched build, which the sources do not name

## Fix

- Apply the Oracle Critical Patch Update fix for WebCenter Sites; the fixed version is unknown from the sources
- Restrict HTTP access to WebCenter Sites to trusted networks until patched

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91240

## From the sources

Vulnerability in the Oracle WebCenter Sites product of Oracle Fusion Middleware (component: WebCenter Sites).  Supported versions that are affected are 12.2.1.4.0 and  14.1.2.0.0. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle WebCenter Sites.  Successful attacks of this vulnerability can result in  unauthorized access to critical data or complete access to all Oracle WebCenter Sites accessible data. CVSS 3.1 Base Score 5.9 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/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_