---
id: "CVE-2026-91338"
kind: "vulnerability"
aliases: ["CVE-2026-91338"]
title: "Oracle E-Business Suite iSupport: low-privileged users can modify and delete data"
severity: "high"
cvss: 7.1
epss: 0.00225
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise-erp", "isupport", "oracle-ebs", "self-hosted", "vendor"]
not_affected_if: ["isupport-not-installed", "release-outside-range"]
published_at: "2026-10-20T22:20:36+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-2026-91338", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91338", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle E-Business Suite iSupport: low-privileged users can modify and delete data

Oracle's iSupport module in E-Business Suite has a flaw in its Internal operations component that lets a low-privileged user reach it over HTTP. A successful attack can create, change or delete critical iSupport data and read a subset of its data.

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

## How to check

- Confirm whether iSupport is installed in your Oracle E-Business Suite environment and note the release (affected: `12.2.3` through `12.2.15`)
- Check the iSupport version against Oracle's Critical Patch Update advisory listed in NVD for CVE-2026-91338

## Fix

- Apply the Oracle Critical Patch Update fix for iSupport in E-Business Suite; the patched version is unknown from the sources
- Move affected installs off `12.2.3` through `12.2.15` to a patched release

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91338
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91338

## From the sources

Vulnerability in the iSupport product of Oracle E-Business Suite (component: Internal operations).  Supported versions that are affected are 12.2.3-12.2.15. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise iSupport.  Successful attacks of this vulnerability can result in  unauthorized creation, deletion or modification access to critical data or all iSupport accessible data as well as  unauthorized read access to a subset of iSupport accessible data. CVSS 3.1 Base Score 7.1 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/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_