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CVE-2026-27302 – Unauthenticated Remote Code Execution – Adobe Campaign Classic v7 (7.4.3 build 9399

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Summary

CVE-2026-27302 is a critical Incorrect Authorization vulnerability (CWE-863) in Adobe Campaign Classic (ACC) v7 that allows an unauthenticated, remote attacker to execute arbitrary code in the context of the current user, with no user interaction required. Adobe rates this vulnerability with the maximum CVSS v3.1 base score of 10.0, reflecting network exploitability, low attack complexity, no privileges required, and full compromise of confidentiality, integrity, and availability. The flaw affects on-premises ACC v7 installations running build 9399 or earlier and was disclosed alongside Adobe’s August 11, 2026 security bulletin (APSB26-123).

Technical details

  • Root cause: An authorization check is missing or improperly enforced on a component of the Adobe Campaign Classic server, allowing requests that should require valid credentials or elevated privileges to be processed without proper access control (CWE-863: Incorrect Authorization).
  • Trigger conditions: No user interaction, authentication, or special privileges are needed — the flaw can be triggered directly against a network-exposed ACC instance.
  • Attack vector: Network (AV:N) — exploitable remotely over the network against any internet- or intranet-exposed ACC v7 server.
  • Impact: Successful exploitation results in arbitrary code execution in the context of the user running the Campaign Classic service, which can lead to full compromise of the affected host, including unauthorized access to marketing/customer data managed by the platform and potential lateral movement within the environment.

Affected software

  • Adobe Campaign Classic v7: build 9399 and earlier (all builds up to and including 9399)

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 v7 to build 9400 or later, as released in Adobe Security Bulletin APSB26-123.
  • If immediate patching is not possible:
    • Restrict network access to the Campaign Classic management/application interfaces to trusted internal networks or VPN only; do not expose ACC servers directly to the internet.
    • Place the ACC server behind a properly configured firewall/WAF and monitor for anomalous or unauthenticated requests to Campaign Classic endpoints.
    • Review server and application logs for signs of unauthorized access or code execution attempts prior to patching.
    • Prioritize this update given the CVSS 10.0 rating and Adobe’s highest severity classification for this release.

References

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