Oracle Identity Manager: Privilege escalation via OIM Legacy UI
Summary
A flaw in the OIM Legacy UI component of Oracle Identity Manager (versions 12.2.1.4.0 and 14.1.2.1.0) allows an attacker with a low-privileged account and network access via HTTPS to compromise the product. According to Oracle's CVE record, a successful attack can lead to a takeover of Oracle Identity Manager with high impact on confidentiality, integrity and availability. Exploitation requires no user interaction, and no public exploit or evidence of in-the-wild exploitation was found at the time of writing.
Affected
- Oracle Identity Manager 12.2.1.4.0
- Oracle Identity Manager 14.1.2.1.0
- Component: OIM Legacy UI
Fixed in
Unknown. Fixed builds are to be taken from Oracle's October 2026 Critical Patch Update advisory (risk matrix) or My Oracle Support.
Workaround
Unknown. No vendor-published workaround was found. Interim measure: restrict network access to the OIM Legacy UI to admin networks or VPN.
Exploitation
- CVSS 3.1 base score 8.8 (High), vector AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation none, automatable no, technical impact total
- No KEV listing, exploitation report or public proof of concept found
- NVD analysis and CWE (CWE-284) still awaiting confirmation
Our recommendation
- Check whether Oracle Identity Manager is in use and whether the OIM Legacy UI is reachable from the internet or untrusted networks
- Restrict access to the OIM Legacy UI to admin networks or VPN as an interim measure
- Apply the October 2026 Oracle Critical Patch Update, verifying the fixed build in the advisory
- Review accounts with low privileges on the OIM and monitor for suspicious activity
- Recheck CISA KEV and exploitation status in the coming days
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle Critical Patch Update Advisory October 2026 www.oracle.com
- NVD mirror: CVE-2026-83402 vulners.com
- Strix CVE summary: CVE-2026-83402 www.strix.ai
- Oracle CPU blog October 2026 blogs.oracle.com
- Waratek analysis of October 2026 CPU (third party) waratek.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, 11:43.
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 HTTPS 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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