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CVE-2026-35300 – Critical Unauthenticated RCE in Core Component – Oracle WebLogic Server 12.2.1.4…

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Summary

CVE-2026-35300 is a critical severity vulnerability residing in the Core component of Oracle WebLogic Server, assigned a CVSS v3.1 base score of 9.8. The flaw is exploitable by unauthenticated remote attackers over the network with no user interaction required, resulting in full compromise of confidentiality, integrity, and availability of the targeted system. Oracle has released patches addressing this issue as part of the June 2026 Critical Patch Update.

Technical details

  • Affected component: Oracle WebLogic Server Core component
  • Trigger conditions: No authentication or user interaction is required; any network-reachable WebLogic instance is a viable target
  • Attack vector: Remote, unauthenticated exploitation over TCP — targeting standard WebLogic listener ports (HTTP/HTTPS 7001/7002, T3, IIOP)
  • Impact: Full compromise of confidentiality, integrity, and availability, consistent with unauthenticated remote code execution on the underlying server

Affected software

  • Oracle WebLogic Server 12.2.1.4.0
  • Oracle WebLogic Server 14.1.1.0.0
  • Oracle WebLogic Server 14.1.2.0.0
  • Oracle WebLogic Server 15.1.1.0.0

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Apply the Oracle Critical Patch Update for June 2026. Patch installation instructions are available via the Oracle CPU June 2026 Patch Availability Document (My Oracle Support Note CPU195), accessible through My Oracle Support.
  • If immediate patching is not feasible: Restrict network access to WebLogic application and administrative ports (TCP 7001, 7002, T3, IIOP) to explicitly trusted IP ranges. Remove or block any direct public internet exposure of WebLogic instances until the patch is applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

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2

Monitor for new CVEs

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3

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Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

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5

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By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Confirmation of verified exploitable assets
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