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CVE-2026-84412 – Unauthenticated Remote Code Execution – Adobe Campaign Classic ≤ 7.4.4 build 9401

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Summary

CVE-2026-84412 is a critical code injection vulnerability (CWE-94) in Adobe Campaign Classic (ACC) that allows an unauthenticated, remote attacker to execute arbitrary code in the context of the current user. The flaw carries the maximum CVSS v3.1 base score of 10.0, reflecting network exploitability with no privileges or user interaction required. It was disclosed by Adobe on September 8, 2026 as part of security bulletin APSB26-142 and formally published September 22, 2026.

Technical details

  • Root cause: Improper control of code generation ("Code Injection," CWE-94) within Adobe Campaign Classic’s server-side application logic, allowing attacker-supplied input to be interpreted and executed as code.
  • Trigger conditions: No authentication, privileges, or user interaction are required to exploit the flaw; the vulnerable component is reachable directly over the network.
  • Attack vector: Network (AV:N) — an attacker sends a specially crafted request to an exposed ACC instance to trigger code execution.
  • Impact: Full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H), with a scope change (S:C) meaning the attacker can affect resources beyond the vulnerable component itself — effectively arbitrary code execution in the context of the current user on the underlying server.
  • Deployment scope: According to Adobe, this bulletin applies only to fully on-premise Adobe Campaign Classic deployments and to the on-premise components of hybrid deployments; Adobe-hosted instances were already remediated and require no customer action.
  • Exploitation status: Adobe states it is not aware of any exploits in the wild for this issue at the time of disclosure.

Affected software

  • Adobe Campaign Classic (ACC) v7.4.4 build 9401 and earlier, on Windows and Linux (on-premise and on-premise components of hybrid deployments)

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 v7.4.4 build 9402 or later, as specified in Adobe security bulletin APSB26-142.
  • If immediate patching is not possible:
    • Restrict network access to Adobe Campaign Classic management and application interfaces to trusted internal networks or VPN only, removing any unnecessary direct internet exposure.
    • Monitor ACC server logs and network traffic for anomalous or unexpected requests indicative of code injection attempts.
    • Prioritize patching for internet-facing, on-premise ACC instances given the unauthenticated, network-exploitable nature of this vulnerability.

References

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