---
id: "CVE-2026-91542"
kind: "vulnerability"
aliases: ["CVE-2026-91542"]
title: "Oracle WebCenter Sites: unauthenticated HTTP flaw exposes critical data"
severity: "high"
cvss: 7.5
epss: 0.00398
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["oracle-fusion-middleware", "oracle-webcenter-sites", "self-hosted", "vendor"]
not_affected_if: ["not-running-webcenter-sites"]
published_at: "2026-10-20T22:20:57+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-25T12:38:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91542", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91542", "first_seen_at": "2026-10-25T12:38:51+00:00"}]
---

# Oracle WebCenter Sites: unauthenticated HTTP flaw exposes critical data

Oracle WebCenter Sites versions 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 gives unauthorized read access to critical data and potentially all data the product can access.

_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 referenced by NVD for the exact patched builds (unknown from the sources given)

## Fix

- Apply the Oracle patch for WebCenter Sites listed in the Oracle security advisory (exact patched version unknown from the sources)
- Restrict HTTP access to WebCenter Sites to trusted networks until patched

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91542
- 2026-10-25T12:38:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91542

## 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. Easily exploitable 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 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_