---
id: "CVE-2026-91407"
kind: "vulnerability"
aliases: ["CVE-2026-91407"]
title: "Oracle Identity Manager REST flaw lets low-privilege users take over server"
severity: "high"
cvss: 8.8
epss: 0.00418
exploited: false
status: "open"
category: "vendor"
products: [{"name": "Oracle Identity Manager", "fixed": [], "affected": "12.2.1.4.0, 14.1.2.1.0", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["oracle-fusion-middleware", "oracle-identity-manager", "self-hosted", "vendor"]
not_affected_if: ["default-config", "managed-hosting"]
published_at: "2026-10-20T22:20:44+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-2026-91407", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:55:10+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91407", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Identity Manager REST flaw lets low-privilege users take over server

Oracle Identity Manager 12.2.1.4.0 and 14.1.2.1.0 have a flaw in their REST web services component. An attacker with a low-privileged account over HTTP can fully take over the server, reading, changing and disrupting it.

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

## Affected

- vendor:Oracle Identity Manager affected 12.2.1.4.0, 14.1.2.1.0 fixed ?

## How to check

Run Oracle Identity Manager 12.2.1.4.0 or 14.1.2.1.0? Check the installed version and OPatch inventory (opatch lsinventory) against the October 2026 CPU Fusion Middleware patch availability document on My Oracle Support. Tenable plugin 370487 flags by version only. Also look at who can reach the OIM REST endpoints over HTTP: any low-privileged account is enough.

## Fix

Apply the Oracle Identity Manager patch from the October 2026 CPU (Fusion Middleware patch availability document on My Oracle Support). The exact patch number is unknown here: it needs a MOS login. Oracle names no workaround; limit network access to OIM REST endpoints until patched.

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91407
- 2026-10-23T23:55:10+00:00 analyst — Oracle October 2026 CPU lists Identity Manager 12.2.1.4.0 and 14.1.2.1.0 (Fusion Middleware patch doc); Tenable plugin 370487 confirms the REST WebServices component. The exact patch number is behind My Oracle Support and was not readable. No workaround, no public PoC and no exploitation found; no X/Bluesky search done.
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91407

## Documents

- [advisory] Oracle Critical Patch Update Advisory - October 2026 https://www.oracle.com/security-alerts/cpuoct2026.html
- [mentions] Tenable Nessus 370487: Oracle Identity Manager (October 2026 CPU) https://www.tenable.com/plugins/nessus/370487

## From the sources

Vulnerability in the Oracle Identity Manager product of Oracle Fusion Middleware (component: REST WebServices).  Supported versions that are affected are 12.2.1.4.0 and  14.1.2.1.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Identity Manager.  Successful attacks of this vulnerability can result in takeover of Oracle Identity Manager. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

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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_