Oracle Identity Manager: Improper access control in OIM Legacy UI
Summary
Oracle Identity Manager (OIM) versions 12.2.1.4.0 and 14.1.2.1.0 are affected by a flaw in the OIM Legacy UI component, classified as improper access control (CWE-284). An attacker with a low-privileged account and network access via HTTP can compromise the product, with a possible full takeover (CVSS 3.1: 8.8). The vendor advisory is the authoritative source for details, and the record is still awaiting NVD analysis.
Affected
- Oracle Identity Manager 12.2.1.4.0
- Oracle Identity Manager 14.1.2.1.0
- Component: OIM Legacy UI
Fixed in
Unknown. Check Oracle's October 2026 Critical Patch Update for the patch that addresses this CVE.
Workaround
- Unknown from the vendor. A third-party, unverified suggestion is to restrict HTTP access to the OIM web interface to trusted IP addresses using firewall rules.
- Enforce least privilege and role-based access for all OIM accounts.
- If the business does not need the Legacy UI, restrict access to it or disable it.
Exploitation
- No evidence of exploitation in the wild found.
- No public proof of concept found.
- One aggregator lists the CVE as not in the CISA KEV catalog; this is unverified and should be checked directly on CISA.
- A different OIM flaw (CVE-2025-61757) was added to CISA KEV; it is not this CVE.
Our recommendation
- Confirm whether you run OIM 12.2.1.4.0 or 14.1.2.1.0 and whether it is reachable from the internet or untrusted networks.
- Check Oracle's October 2026 Critical Patch Update and apply the fix in your next maintenance window.
- Until patched, restrict network access to OIM and the Legacy UI, and disable the Legacy UI if it is not required.
- Review OIM admin and service accounts, enforce MFA on access paths, and monitor for new or changed accounts and roles in OIM.
- Note: the transport detail (HTTP vs. HTTPS) and a possible duplicate (CVE-2026-91259) are unverified.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle Security Alert Advisory October 2026 (CPU) www.oracle.com
- NVD record via Vulners vulners.com
- Strix CVE record CVE-2026-83403 www.strix.ai
- Oracle Identity Management Stack Patch Bundle (SPB) documentation docs.oracle.com
- Vulners record CVE-2026-91259 (possible duplicate) vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 11:44.
Original description (NVD)
Vulnerability in the Oracle Identity Manager product of Oracle Fusion Middleware (component: OIM Legacy UI). 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).
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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