Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Oracle describes easily exploitable, unauthenticated network TCP access yielding full takeover, so AV:N/AC:L/PR:N/UI:N with C:H/I:H/A:H; scope unchanged as compromise stays within the Coherence process.
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 unauthenticated compromise of Oracle Coherence (a component of Oracle Fusion Middleware) allows attackers with only network TCP access to fully take over the affected instance, per Oracle's July 2026 Critical Patch Update. The flaw carries a CVSS 9.8 and affects supported versions 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0. No public exploit identified at time of analysis, but the trivial exploitability (AV:N/AC:L/PR:N/UI:N) and full confidentiality, integrity, and availability impact make this a high-priority patch item.
Technical ContextAI
Oracle Coherence is Oracle's in-memory data grid (IMDG) and distributed caching/clustering platform used to scale stateful Java applications, commonly deployed alongside Oracle WebLogic Server within Fusion Middleware. The vulnerable 'Core' component handles clustering and inter-node communication over TCP, which is the exposed attack surface here. Oracle does not assign a CWE (listed as N/A), but network-reachable takeover flaws in Coherence historically stem from unsafe deserialization of untrusted objects received over the cluster/proxy protocol - a class consistent with CWE-502 - though this root cause is inferred, not confirmed by Oracle.
RemediationAI
Apply the fixes delivered in the Oracle July 2026 Critical Patch Update (Patch available per vendor advisory: https://www.oracle.com/security-alerts/cpujul2026.html); Oracle publishes exact patch numbers per product version in the CPU matrix, and administrators should apply the CPU corresponding to their installed release (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, or 15.1.1.0.0). Because Oracle CPUs are cumulative, the latest CPU supersedes prior fixes. If patching cannot be done immediately, the primary compensating control is network isolation: restrict TCP access to Coherence cluster and proxy/extend ports (commonly the cluster port and any configured Coherence*Extend proxy listener) to trusted management subnets via firewall/security-group rules, and ensure no Coherence port is exposed to the internet or untrusted VLANs - the trade-off is that legitimate remote Extend clients must be re-scoped or tunneled. Where deserialization is the suspected vector, enabling and tightening Coherence serialization filters/allowlists (POF or JEP-290-style object-input filtering) reduces exposure but can break clients relying on default Java serialization and does not substitute for the vendor patch.
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-46645
GHSA-54f2-49jv-vh8q