Oracle Access Manager: Improper authentication in Authentication Engine
Summary
Oracle Access Manager, part of Oracle Fusion Middleware, contains a flaw in its Authentication Engine that is reachable over HTTP. Versions 12.2.1.4.0 and 14.1.2.1.0 are affected. An unauthenticated attacker with network access can exploit it under high attack complexity, which may compromise data in Access Manager and affect other systems, because Access Manager acts as a single sign-on gateway. Oracle rates the CVSS 3.1 base score at 8.7, with high impact on confidentiality and integrity.
Affected
- Oracle Access Manager 12.2.1.4.0
- Oracle Access Manager 14.1.2.1.0
Fixed in
- Fix included in the Oracle Critical Patch Update of October 2026 (released 20 October 2026).
- Patch IDs per version: Unknown. Check the patch availability table in the Oracle advisory.
Workaround
Unknown. No vendor workaround was identified in the sources. Check the Oracle advisory for a Workarounds section.
- Interim measure (not from the vendor): restrict network access to the Access Manager HTTP endpoints and place them behind a reverse proxy or WAF with access rules until patching is complete.
Exploitation
- No confirmed exploitation of this CVE found.
- No public proof of concept found.
- EPSS 0.0031 (low) at the time of the snapshot.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
Our recommendation
- Confirm whether any Oracle Access Manager instance exists and which version it runs.
- If one exists, apply the October 2026 Oracle CPU first on internet-facing instances.
- If patching is delayed, restrict network access to the HTTP endpoints now.
- Review logs for unusual access to Access Manager endpoints.
- Note that CVE-2026-87337, a separate Access Manager flaw rated 10.0, was fixed in the same CPU cycle.
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
- Strix CVE page CVE-2026-83426 www.strix.ai
- Vulners (NVD mirror) CVE-2026-83426 vulners.com
- Vulners (CIRCL) CVE-2026-83426 vulners.com
- Tenable Nessus plugin 369015 www.tenable.com
- Waratek: Oracle October 2026 CPU waratek.com
- Brandefense: Oracle October 2026 CPU brandefense.io
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 1 Nov 2026, 01:17.
Original description (NVD)
Vulnerability in the Oracle Access Manager product of Oracle Fusion Middleware (component: Authentication Engine). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.1.0. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Access Manager. While the vulnerability is in Oracle Access Manager, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Access Manager accessible data as well as unauthorized access to critical data or complete access to all Oracle Access Manager accessible data. CVSS 3.1 Base Score 8.7 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N).
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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