EUVD-2026-79304
GHSA-96vr-v34g-rr34
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor-described pre-auth, low-complexity network HTTP attack yielding full OAM takeover justifies AV:N/AC:L/PR:N/UI:N and C:H/I:H/A:H; scope unchanged within the OAM system.
Primary rating from Vendor (oracle).
CVSS VectorVendor: oracle
Lifecycle Timeline
3DescriptionCVE.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
Authentication bypass in the Oracle Access Manager (Fusion Middleware) Authentication Engine lets unauthenticated remote attackers with HTTP network access compromise OAM instances running 12.2.1.4.0 or 14.1.2.1.0, resulting in complete takeover of the affected service with high confidentiality, integrity and availability impact (CVSS 3.1 base 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Successful exploitation of the CWE-287 flaw effectively grants the attacker the identity and authorization context the Authentication Engine is supposed to enforce, so any downstream application trusting OAM for single sign-on or access decisions is exposed to the same session. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network HTTP access to an Oracle Access Manager 12.2.1.4.0 or 14.1.2.1.0 instance's Authentication Engine; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) no authentication, no user interaction, and no special configuration are needed, so default deployments are exploitable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, and the 9.8 CVSS score is well-calibrated rather than inflated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Oracle Critical Patch Update for September 2026 referenced at https://www.oracle.com/security-alerts/cspusep2026.html, which contains the fix for the Authentication Engine and covers Access Manager 12.2.1.4.0 and 14.1.2.1.0; this is a vendor-released patch and the primary remediation, so treat OAM upgrades as emergency change rather than routine maintenance. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Oracle Access Manager deployments and identify every instance running 12.2.1.4.0 or 14.1.2.1.0, then restrict network access to the OAM Authentication Engine endpoint at the perimeter and eliminate any direct internet exposure; validate that only trusted internal sources can reach the service and increase logging and alerting on anomalous authentication successes from unexpected source addresses. …
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Same weakness CWE-287 – Improper Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
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