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CVE-2026-61138 – Improper Access Control / Unauthorized Data Exposure – Oracle Complex Maintenanc…

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Summary

CVE-2026-61138 is a high-severity improper access control vulnerability (CWE-284) affecting Oracle Complex Maintenance, Repair and Overhaul (CMRO), a fully web-based module within Oracle E-Business Suite (EBS). The flaw is exploitable over the network without any authentication or user interaction, allowing remote attackers to gain unauthorized read access to sensitive CMRO data and perform limited unauthorized data manipulation. It was published on July 21, 2026 as part of Oracle’s July 2026 Critical Patch Update.

Technical details

  • Root cause: An improper access control flaw exists in the Internal Operations component of Oracle CMRO, accessible over HTTP. The control deficiency allows network-based requests to bypass authorization checks that should gate access to sensitive application data.
  • Trigger conditions: No authentication or user interaction is required. Attack complexity is rated High (AC:H), indicating that exploitation depends on specific conditions or configurations that may not be present in all deployments, but do apply to a subset of production environments.
  • Attack vector: Network (AV:N) — exploitable remotely over the internet via HTTP, with no prior foothold on the target system required.
  • Impact: Successful exploitation enables unauthorized read access to critical or complete CMRO-accessible data (Confidentiality: High), and unauthorized insert, update, or delete access to a subset of CMRO data (Integrity: Low). The Changed scope (S:C) indicates the impact extends beyond the vulnerable component itself, affecting resources managed by a different security context within the EBS environment.

Affected software

  • Oracle Complex Maintenance, Repair and Overhaul (Oracle E-Business Suite) versions 12.2.3 through 12.2.15

Severity

  • CVSS v3.1 Base Score: 7.5 (High)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate action: Apply the Oracle July 2026 Critical Patch Update (CPU), which contains the vendor-provided fix for this vulnerability. Oracle’s advisory provides patch availability details and application instructions.
  • Network mitigation: If patching cannot be completed immediately, restrict external network access to Oracle EBS/CMRO-facing HTTP endpoints using perimeter controls (firewall rules, reverse proxy allowlisting) to limit exposure to untrusted networks. This does not eliminate the vulnerability but reduces the attack surface while patching is scheduled.
  • Prioritize instances where CMRO Internal Operations endpoints are internet-accessible, as these represent the most direct risk.

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)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

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

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

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

Drive Fast and Actionable Remediation

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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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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