Severity by source
AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:A per Oracle's physical-segment requirement, PR:L for the required low-privilege foothold, AC:L/UI:N as stated, and C/I/A all High given full OAM takeover.
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 low privileged attacker with access to the physical communication segment attached to the hardware where the Oracle Access Manager executes to compromise Oracle Access Manager. Successful attacks of this vulnerability can result in takeover of Oracle Access Manager. CVSS 3.1 Base Score 8.0 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
AnalysisAI
Full takeover of Oracle Access Manager (Authentication Engine component) in Oracle Fusion Middleware 12.2.1.4.0 and 14.1.2.1.0 is possible for a low-privileged attacker positioned on the same physical/adjacent network segment as the host running OAM. Per the CVSS vector (AV:A/AC:L/PR:L), exploitation is low-complexity and requires only some level of existing authenticated access plus adjacent network reachability, yielding complete confidentiality, integrity, and availability compromise. No public exploit identified at time of analysis; addressed in Oracle's July 2026 Critical Patch Update.
Technical ContextAI
Oracle Access Manager is Oracle's enterprise identity and access management / single sign-on platform within Oracle Fusion Middleware, brokering authentication for downstream web applications and services. The flaw resides specifically in the Authentication Engine component, the subsystem responsible for validating credentials and issuing session assertions, so a compromise here undermines the trust anchor for every protected application that relies on OAM. No CWE was assigned in the source data, but the Oracle-supplied tag 'Information Disclosure' combined with the full C:H/I:H/A:H impact indicates the weakness allows an adjacent attacker to subvert the authentication logic itself rather than merely leak data. The affected footprint per CPE is cpe:2.3:a:oracle_corporation:oracle_access_manager, matching the two named supported releases.
RemediationAI
Apply the fixes delivered in Oracle's July 2026 Critical Patch Update; patch available per vendor advisory at https://www.oracle.com/security-alerts/cpujul2026.html, which is the single source Oracle publishes fix versions through for OAM 12.2.1.4.0 and 14.1.2.1.0 (no standalone fix version was provided in the input, so consult the CPU matrix for the exact patch/PSU identifier for your release). Because the vector requires adjacency to the OAM host's network segment (AV:A), the most effective compensating control until patching is network segmentation: isolate OAM servers onto a dedicated, tightly access-controlled VLAN, restrict which hosts and accounts can reach the authentication segment, and monitor east-west traffic to that segment - the trade-off is added routing/firewall complexity and potential impact on legitimate management access. Tightening and auditing the low-privileged accounts that could serve as the PR:L foothold further reduces exploitability.
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-46740
GHSA-xx6w-f85v-2x49