Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Oracle states unauthenticated network TCP exploitation that is easily exploitable and yields full takeover, so AV:N/AC:L/PR:N/UI:N and C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (oracle).
CVSS VectorVendor: oracle
Lifecycle Timeline
2DescriptionCVE.org
Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0 and 15.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCP to compromise Oracle Coherence. Successful attacks of this vulnerability can result in takeover of Oracle Coherence. 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
Remote takeover of Oracle Coherence (Core component) in Oracle Fusion Middleware allows an unauthenticated attacker with only TCP network access to fully compromise the in-memory data grid, per Oracle's July 2026 Critical Patch Update. The CVSS 3.1 base score is 9.8 with high confidentiality, integrity, and availability impact, and Oracle rates it 'easily exploitable.' No public exploit has been identified at time of analysis and the flaw is not listed in CISA KEV, but the combination of no authentication and full-system takeover makes it a top-priority patch.
Technical ContextAI
Oracle Coherence is a Java-based distributed in-memory data grid and caching platform used to scale and cluster stateful application data across Fusion Middleware and WebLogic-based deployments. The flaw resides in the 'Core' component, which handles cluster membership and inter-node communication over Coherence's TCP-based cluster/proxy protocols (Coherence*Extend / TCMP). Oracle did not assign a CWE (CWE: N/A), but historically Coherence takeover flaws in this class stem from unsafe deserialization of untrusted objects received over the cluster/extend TCP listener, which lets a remote peer drive Java object instantiation and gadget-chain execution. The CPE 'cpe:2.3:a:oracle_corporation:oracle_coherence' confirms this is the standalone Coherence product rather than a bundled component.
RemediationAI
Apply the fixes from the Oracle Critical Patch Update of July 2026 (https://www.oracle.com/security-alerts/cpujul2026.html) for each affected version (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0); an exact fixed build number was not included in this input, so obtain the precise patch/bundle-patch identifier from that advisory and MOS. Because the vector is unauthenticated network TCP, the highest-value compensating control until patching is network isolation: restrict the Coherence cluster (TCMP) and Coherence*Extend proxy listener ports to trusted management subnets via firewall/ACLs and ensure no Coherence listener is internet-exposed (side effect: cross-datacenter or client-tier connectivity may break if segmentation is too tight). Where supported, enable Coherence security features such as TLS/SSL on cluster and Extend connections and identity/host-based access control to authenticate peers (side effect: configuration and certificate management overhead), and if the class involves deserialization, enforce POF/serialization allowlists rather than default Java serialization. These are stopgaps only - the Oracle CPU patch is the definitive fix.
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-46644
GHSA-wmm7-2925-jr64