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CVE-2026-82004 – Unauthenticated OS Command Injection RCE – Adobe Campaign Classic ≤ 7.4.4 build 940

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Summary

CVE-2026-82004 is a critical OS command injection vulnerability (CWE-78) in Adobe Campaign Classic (ACC) that allows an unauthenticated, remote attacker to achieve arbitrary code execution on the underlying server with no user interaction required. The flaw was disclosed by Adobe on September 8, 2026, as part of its September 2026 Patch Tuesday release, and carries the maximum CVSS v3.1 base score of 10.0. Adobe has rated the fix "Priority 1," meaning administrators should apply the update within 3 days of release; Adobe states it is not aware of any active exploitation at the time of disclosure.

Technical details

  • Root cause: Improper neutralization of special elements used in an OS command (CWE-78) within Adobe Campaign Classic, allowing attacker-supplied input to be passed unsanitized into a system command.
  • Trigger conditions: No authentication or user interaction is required; the vulnerable functionality is reachable over the network.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Successful exploitation results in arbitrary command/code execution on the host running Adobe Campaign Classic. The CVSS Scope is "Changed" (S:C), indicating the vulnerability can impact resources beyond the vulnerable component’s own security scope, and confidentiality, integrity, and availability impacts are all rated High.

Affected software

  • Adobe Campaign Classic (ACC) — all versions from 0 through 7.4.4 build 9401

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade Adobe Campaign Classic to version 7.4.4 build 9402 or later, as published in Adobe Security Bulletin APSB26-142. Adobe has designated this a Priority 1 update — apply within 3 days of release.
  • If patching cannot be completed immediately: Restrict network access to the Campaign Classic management/application interfaces to trusted internal networks or VPN only, and monitor server logs for anomalous command execution or process spawning until the patch is applied. No official workaround beyond restricting exposure has been published by Adobe.

References

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