CVE-2026-70927: Oracle Workflow DOS Vulnerability

CVE-2026-70927 Overview

CVE-2026-70927 is a denial-of-service vulnerability in the Oracle Workflow product of Oracle E-Business Suite, specifically within the Workflow Notification Mailer component. The flaw affects supported versions 12.2.3 through 12.2.15. An unauthenticated attacker with network access over HTTP can exploit the issue to cause a hang or a frequently repeatable crash, resulting in a complete denial of service against Oracle Workflow. The vulnerability requires no user interaction and no privileges, making it network-exploitable at low complexity. Oracle disclosed the issue in the August 2026 Critical Patch Update Security Alert.

Critical Impact
Remote, unauthenticated attackers can trigger a complete denial of service against the Oracle Workflow Notification Mailer, disrupting business-critical email notifications across the E-Business Suite deployment.

Affected Products

Oracle E-Business Suite — Oracle Workflow 12.2.3
Oracle E-Business Suite — Oracle Workflow versions 12.2.4 through 12.2.14
Oracle E-Business Suite — Oracle Workflow 12.2.15

Discovery Timeline

2026-08-18 - CVE-2026-70927 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-70927

Vulnerability Analysis

The vulnerability resides in the Workflow Notification Mailer, the component responsible for processing and dispatching workflow notifications through email in Oracle E-Business Suite. An unauthenticated attacker sends crafted HTTP traffic to the affected component and forces the service into a hang state or a repeatable crash. Because the Notification Mailer is central to workflow-based business processes, a successful attack disrupts approvals, alerts, and inter-system automation dependent on workflow notifications.

The issue impacts availability only. Confidentiality and integrity are not affected according to Oracle's advisory. The condition is repeatable, meaning attackers can restart the denial of service after any recovery attempt until the environment is patched.

Root Cause

Oracle has not published the internal root cause. Based on the advisory metadata, the flaw is triggered through network-reachable HTTP processing within the Workflow Notification Mailer and yields resource exhaustion or an unrecoverable service state. Refer to the Oracle Security Alert for vendor-authoritative technical detail.

Attack Vector

Exploitation requires only network access to the HTTP interface exposed by the Workflow Notification Mailer. No authentication, no user interaction, and no elevated privileges are required. An attacker on an internet-reachable or internally reachable network segment can repeatedly deliver the malicious request to keep the Workflow component offline. See the Oracle Security Alert for the vendor description.

Detection Methods for CVE-2026-70927

Indicators of Compromise

Repeated unexpected termination or hang states of the Workflow Notification Mailer service (WFMLRSVC) in Oracle Concurrent Manager logs.
Unusual HTTP requests targeting Workflow Notification Mailer endpoints from unauthenticated or untrusted sources.
Sudden growth of queued notifications in the WF_NOTIFICATIONS and mailer outbound queues without dispatch.

Detection Strategies

Monitor the Notification Mailer service state through Oracle Applications Manager and alert on repeated STOPPED_ERROR transitions.
Inspect HTTP access logs on the E-Business Suite tier for repeated requests to Workflow endpoints from a single source preceding service failure.
Correlate application-tier crash events with inbound network traffic patterns to identify remote trigger sources.

Monitoring Recommendations

Enable verbose logging on the Workflow Notification Mailer and forward logs to a central SIEM for correlation.
Track availability metrics of the Workflow component and alert on downtime exceeding baseline thresholds.
Baseline normal HTTP request volume to Workflow endpoints and alert on statistical anomalies.

How to Mitigate CVE-2026-70927

Immediate Actions Required

Apply the fixes distributed in the Oracle August 2026 Critical Patch Update Security Alert to all affected Oracle E-Business Suite instances running Workflow 12.2.3 through 12.2.15.
Restrict network access to the Workflow Notification Mailer HTTP interface so it is reachable only from trusted management networks.
Inventory all E-Business Suite environments, including non-production, and confirm patch status for the Workflow component.

Patch Information

Oracle released patches for CVE-2026-70927 as part of the August 2026 Critical Patch Update Security Alert. Administrators must consult the Oracle Security Alert for the exact patch identifiers applicable to each supported version between 12.2.3 and 12.2.15.

Workarounds

Place a web application firewall or reverse proxy in front of the Workflow Notification Mailer to filter unauthenticated requests until patching completes.
Limit inbound HTTP access to the E-Business Suite application tier using network access control lists that permit only required source ranges.
Increase monitoring frequency of the Workflow service and prepare automated restart procedures to reduce recovery time if the service is targeted.

bash

# Example: restrict inbound HTTP to the E-Business Suite application tier
# Replace TRUSTED_CIDR and EBS_HTTP_PORT with environment-specific values
iptables -A INPUT -p tcp --dport ${EBS_HTTP_PORT} -s ${TRUSTED_CIDR} -j ACCEPT
iptables -A INPUT -p tcp --dport ${EBS_HTTP_PORT} -j DROP