---
id: "CVE-2026-91559"
kind: "vulnerability"
aliases: ["CVE-2026-91559"]
title: "Oracle PeopleSoft FIN Manufacturing Brazil: Integration flaw lets local users alter data"
severity: "medium"
cvss: 4.4
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["erp", "on-prem", "oracle", "other", "peoplesoft"]
not_affected_if: ["no-local-logon-to-host", "product-not-deployed"]
published_at: "2026-10-20T22:20:59+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-25T04:35:45+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91559", "first_seen_at": "2026-10-23T21:57:27+00:00"}]
---

# Oracle PeopleSoft FIN Manufacturing Brazil: Integration flaw lets local users alter data

A flaw in the Integration component of Oracle PeopleSoft Enterprise FIN Manufacturing Brazil 9.1 lets a low-privileged user who can log on to the host modify or delete some accessible data. The same flaw can also cause a partial denial of service.

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

## How to check

- Confirm whether PeopleSoft Enterprise FIN Manufacturing Brazil `9.1` is deployed in your environment
- Check the installed patch level against Oracle's Critical Patch Update advisory for the product (unknown from the sources)

## Fix

- Apply the Oracle Critical Patch Update fix for PeopleSoft Enterprise FIN Manufacturing Brazil `9.1` (exact patch unknown from the sources)
- Restrict local logon to PeopleSoft application hosts to low-privileged accounts that need it

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91559

## From the sources

Vulnerability in the PeopleSoft Enterprise FIN Manufacturing Brazil product of Oracle PeopleSoft (component: Integration).   The supported version that is affected is 9.1. Easily exploitable vulnerability allows low privileged attacker with logon to the infrastructure where PeopleSoft Enterprise FIN Manufacturing Brazil executes to compromise PeopleSoft Enterprise FIN Manufacturing Brazil.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of PeopleSoft Enterprise FIN Manufacturing Brazil accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of PeopleSoft Enterprise FIN Manufacturing Brazil. CVSS 3.1 Base Score 4.4 (Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L).

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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_