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CVE-2026-89275 – Unauthenticated RCE via Code Injection – Adobe Campaign Classic ≤ 7.4.4 build 9401

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Summary

CVE-2026-89275 is a critical code injection vulnerability (CWE-94, Improper Control of Generation of Code) in Adobe Campaign Classic (ACC). The flaw allows an unauthenticated, remote attacker to achieve arbitrary code execution in the context of the current user, with no user interaction required. Adobe rates this issue as Critical with the maximum CVSS v3.1 base score of 10.0 and has released a Priority 1 fix under security bulletin APSB26-142.

Technical details

  • Root cause: Adobe Campaign Classic fails to properly control the generation of code from attacker-supplied input, allowing injected code to be executed by the application (CWE-94).
  • Trigger conditions: No authentication and no user interaction are required to exploit the flaw, and the attack complexity is low.
  • Attack vector: Network — the vulnerability is remotely exploitable over the network against exposed Campaign Classic instances.
  • Impact: Successful exploitation results in arbitrary code execution in the context of the current user, with high impact to confidentiality, integrity, and availability, and a changed scope (the attacker can affect resources beyond the vulnerable component).
  • Deployment scope: The issue affects fully on-premise deployments of Adobe Campaign Classic and the on-premise components of hybrid deployments. Adobe-hosted (cloud) instances were already remediated by Adobe and require no customer action.

Affected software

  • Adobe Campaign Classic (ACC) — all versions from 0 through 7.4.4 build 9401, on both Windows and Linux.

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 on-premise Adobe Campaign Classic deployments to version 7.4.4 build 9402 or later, as provided in Adobe Security Bulletin APSB26-142.
  • If immediate patching is not possible: Restrict network exposure of Campaign Classic management and application interfaces to trusted networks only (e.g., VPN or allow-listed IP ranges), and closely monitor Campaign Classic servers for anomalous process execution or unexpected outbound connections until the patch can be applied. Cloud/Adobe-hosted instances do not require action, as Adobe has already remediated them.

References

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