CVE-2026-61340: Oracle MES Auth Bypass Vulnerability

CVE-2026-61340 Overview

CVE-2026-61340 affects the Oracle MES for Process Manufacturing product within Oracle E-Business Suite, specifically the Internal Operations component. The flaw impacts supported versions 12.2.3 through 12.2.15. An unauthenticated attacker with network access over HTTP can exploit the vulnerability, though successful attacks require interaction from a user other than the attacker. The vulnerability introduces a scope change, meaning exploitation can affect resources beyond the vulnerable component. Successful exploitation grants unauthorized read access to all Oracle MES for Process Manufacturing data and permits unauthorized update, insert, or delete operations against a subset of that data.

Critical Impact
Unauthenticated network-based exploitation with user interaction enables full read access and partial write access to Oracle MES for Process Manufacturing data, with scope changes that can impact adjacent products.

Affected Products

Oracle MES for Process Manufacturing 12.2.3
Oracle E-Business Suite Internal Operations component, versions 12.2.3 through 12.2.15
Oracle MES for Process Manufacturing 12.2.15

Discovery Timeline

2026-08-18 - CVE-2026-61340 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-61340

Vulnerability Analysis

The flaw resides in the Internal Operations component of Oracle MES for Process Manufacturing, a manufacturing execution system module within Oracle E-Business Suite. Attackers reach the vulnerable code path over HTTP without authentication. Exploitation requires a legitimate user to perform an action such as visiting a crafted link or interacting with attacker-controlled content. The scope change indicator on the CVSS vector signals that the compromised component can affect resources managed by other Oracle E-Business Suite modules. Confidentiality impact is high because attackers can retrieve all data accessible to the affected component. Integrity impact is limited to partial write access on a subset of records. Availability is not affected.

Root Cause

Oracle has not published detailed root-cause information for CVE-2026-61340. Based on the CVSS profile — network vector, required user interaction, and scope change — the flaw is consistent with a client-facing web interface issue in the Internal Operations component that fails to enforce origin or context validation before executing privileged actions on behalf of an authenticated victim.

Attack Vector

The attacker delivers a crafted HTTP request or link to a victim who has an active session or accessible context within Oracle MES for Process Manufacturing. When the victim interacts with the attacker-supplied content, the request executes against the vulnerable endpoint. The scope change allows the resulting actions to reach data owned by other Oracle E-Business Suite products beyond MES for Process Manufacturing.

See the Oracle Security Alert for vendor-supplied technical details.

Detection Methods for CVE-2026-61340

Indicators of Compromise

Unexpected HTTP requests targeting Oracle MES for Process Manufacturing Internal Operations endpoints from external referrers or unusual user-agent strings.
Bulk read operations against MES data tables that do not match established user behavior baselines.
Unauthorized UPDATE, INSERT, or DELETE events on MES records without a corresponding change-management ticket.

Detection Strategies

Correlate web access logs against authenticated user sessions to identify requests triggered by off-domain referrers or cross-origin interactions.
Baseline normal query volume for Internal Operations endpoints and alert on statistical outliers.
Monitor Oracle E-Business Suite audit trails for scope-crossing activity where MES sessions touch data owned by unrelated modules.

Monitoring Recommendations

Enable full HTTP access logging on Oracle E-Business Suite application tier hosts and forward logs to a centralized analytics platform.
Enable Oracle Database Fine-Grained Auditing (FGA) on tables owned by Oracle MES for Process Manufacturing schemas.
Track user interaction patterns preceding sensitive MES actions to identify social-engineering-driven exploitation.

How to Mitigate CVE-2026-61340

Immediate Actions Required

Apply the Oracle Critical Patch Update referenced in the Oracle Security Alert to all Oracle E-Business Suite instances running versions 12.2.3 through 12.2.15.
Inventory all Oracle MES for Process Manufacturing deployments and confirm patch coverage across production, test, and disaster-recovery environments.
Restrict inbound HTTP access to Oracle E-Business Suite application servers to trusted network segments where feasible.
Notify MES users of the user-interaction attack vector and reinforce awareness of unsolicited links.

Patch Information

Oracle addressed CVE-2026-61340 in the August 2026 Critical Patch Update. Administrators should download and apply the patch identified in the Oracle Security Alert for their specific Oracle E-Business Suite version.

Workarounds

Place Oracle E-Business Suite web tiers behind a web application firewall configured to enforce strict Referer and Origin header validation on Internal Operations endpoints.
Enforce short session lifetimes and require re-authentication for sensitive MES operations to reduce the exploitation window.
Segment MES for Process Manufacturing users into a dedicated network zone and block browsing to untrusted external sites from workstations that access the application.

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# Configuration example
# Refer to the Oracle Security Alert for the authoritative patch procedure:
# https://www.oracle.com/security-alerts/cspuaug2026.html