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CVE-2026-70926 – Unauthenticated RCE via SMTP – Oracle E-Business Suite (Oracle Workflow, Workflow N

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Summary

CVE-2026-70926 is a critical, easily exploitable vulnerability in the Workflow Notification Mailer component of Oracle Workflow, part of Oracle E-Business Suite (EBS). It allows an unauthenticated attacker with network access via SMTP to fully compromise Oracle Workflow, resulting in complete takeover of the affected component. The flaw carries a CVSS v3.1 base score of 9.8 (Critical) and was published by Oracle on August 18, 2026, as part of its August 2026 Critical Security Patch Update (CSPU).

Technical details

  • Root cause: A flaw in the Workflow Notification Mailer component of Oracle Workflow that improperly handles inbound data received over SMTP, enabling unauthenticated manipulation of the underlying system.
  • Trigger conditions: No authentication or user interaction is required; an attacker only needs network access to the SMTP interface used by the Workflow Notification Mailer.
  • Attack vector: Network (AV:N), low attack complexity (AC:L) — Oracle rates this as "easily exploitable."
  • Impact: Successful exploitation results in complete compromise of Oracle Workflow, with full loss of confidentiality, integrity, and availability (C:H/I:H/A:H).
  • Scope: Unchanged (S:U) — impact is confined to the vulnerable Oracle Workflow component, but given its role within EBS this can enable broader compromise of the EBS environment.

Affected software

  • Oracle E-Business Suite — Oracle Workflow component (Workflow Notification Mailer)
  • Supported versions 12.2.3 through 12.2.15

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: 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-provided fix for CVE-2026-70926 as released in Oracle’s August 2026 Critical Security Patch Update (CSPU) for Oracle E-Business Suite / Oracle Workflow. Upgrade or patch all instances running the affected 12.2.3–12.2.15 releases to the version(s) specified in Oracle’s advisory.
  • If immediate patching is not possible:
    • Restrict or firewall network access to the SMTP listener used by the Workflow Notification Mailer so it is reachable only from trusted mail infrastructure, not the open internet.
    • Monitor SMTP traffic to Oracle Workflow Notification Mailer endpoints for anomalous or malformed messages that could indicate exploitation attempts.
    • Given the unauthenticated, network-exploitable nature of this flaw and Oracle’s "easily exploitable" rating, treat internet-facing Oracle E-Business Suite / Oracle Workflow deployments as high priority for emergency patching, consistent with prior actively-exploited EBS vulnerabilities.
    • Review Oracle Workflow Notification Mailer logs for signs of prior compromise before and after patching.

References

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