Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Oracle confirms unauthenticated network HTTP exploitation with low complexity and full takeover, so AV:N/AC:L/PR:N/UI:N with high C/I/A.
Primary rating from Vendor (oracle).
CVSS VectorVendor: oracle
Lifecycle Timeline
2DescriptionCVE.org
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. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Access Manager. Successful attacks of this vulnerability can result in takeover of Oracle Access Manager. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
AnalysisAI
Full compromise of Oracle Access Manager is possible when an unauthenticated attacker sends crafted HTTP requests to the Authentication Engine component of affected Oracle Fusion Middleware deployments (12.2.1.4.0 and 14.1.2.1.0). The flaw is rated CVSS 9.8 and, per Oracle, is 'easily exploitable,' resulting in complete takeover of the identity/access layer. No public exploit identified at time of analysis and it is not listed in CISA KEV, but the low-complexity, no-authentication profile makes it a high-priority patch for any Oracle SSO estate.
Technical ContextAI
Oracle Access Manager (OAM) is Oracle Fusion Middleware's enterprise access management and web single sign-on (SSO) platform, fronting authentication and session management for many downstream applications. The vulnerability resides specifically in the Authentication Engine - the subsystem that validates credentials and issues sessions/tokens - which is exactly the component whose compromise cascades to every relying application. Oracle did not assign a CWE (CWE: N/A) and does not disclose the root-cause class in its Critical Patch Update format, so the precise weakness (for example authentication bypass, injection, or deserialization) cannot be confirmed from the available data; the CVSS profile of network, low-complexity, unauthenticated access with full C/I/A impact is consistent with a pre-authentication bypass or remote code execution in the engine.
RemediationAI
Apply the fixes from the Oracle Critical Patch Update of July 2026 (patch available per vendor advisory: https://www.oracle.com/security-alerts/cpujul2026.html); Oracle ships OAM security fixes as CPU bundle patches rather than a single tagged release, so identify and apply the corresponding CPU patch for your exact 12.2.1.4.0 or 14.1.2.1.0 install through My Oracle Support. Because the exact patched build number is not stated in the provided data, verify the correct patch ID against the CPU advisory before scheduling. Until patched, reduce exposure by restricting network reachability of the OAM Authentication Engine endpoints - place OAM admin/login interfaces behind a VPN or IP allowlist and terminate untrusted traffic at a WAF/reverse proxy so only expected authentication flows reach the server; note this can break federation partners or external-facing SSO and remote logins, so validate legitimate access paths before enforcing. Given the pre-authentication nature, monitor OAM access logs for anomalous requests to authentication endpoints as a compensating detection control.
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-47277
GHSA-v25v-j57p-xvpv