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CriticalVulnerabilityCVE-2026-104353updated 27 Oct 2026, 20:35 UTC

Adobe Campaign Classic: flaw lets attackers run commands on the server

A weakness in Adobe Campaign Classic lets someone with a basic user account run their own commands on the computer hosting it. No one else has to click anything for this to happen.

Official, 2 sources
SeverityCriticalCVSS 9.9 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Low-privileged attackerHas a basic account on the system
  2. 2Crafted inputInput is not sanitized before use
  3. 3OS command runsApplication passes input to the operating system
  4. 4Arbitrary code runsRuns as the application's current user
  5. ResultAttacker runs code on the server

What happened

Adobe Campaign Classic (ACC) has an OS command injection flaw (CWE-78), where input is not properly sanitized before being passed to the operating system, allowing arbitrary code execution in the context of the current user. The advisory notes the scope is changed.

Why it is dangerous: A low-privileged attacker could take control of the affected system and act with the same rights as the application's user, potentially reaching further data or systems. Organizations running ACC for marketing and customer communications are at risk.

Are you affected?

You are affected if you run Adobe Campaign Classic (ACC) on a server where low-privileged users or untrusted parties can reach the application.

Adobe Campaign Classic (ACC) - specific versions unknown from the provided material.

What to do

  1. Check Adobe's security bulletin for the ACC patch and apply the fixed version as soon as possible
  2. Restrict network access to ACC servers to trusted users and systems until patched
  3. Review ACC accounts and remove unneeded low-privilege access
  4. Monitor the server for unexpected commands or processes spawned by the ACC application

Timeline

  1. 27 Oct 2026, 17:16 UTC
    Publicly disclosed
  2. 27 Oct 2026, 17:16 UTC
    Reported by NVD · NVD
  3. 27 Oct 2026, 17:20 UTC
    Picked up by Zero Radar
  4. 27 Oct 2026, 20:35 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-104353 · GHSA-8ghg-r6p6-hw6m
CVSS
9.9 / 10
EPSS
1.3% chance of exploitation within 30 days
Disclosed
27 Oct 2026, 17:16 UTC
On Zero Radar
27 Oct 2026, 17:20 UTC (4 min after disclosure)
Last change
27 Oct 2026, 20:35 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Adobe Campaign Classic: flaw lets attackers run commands on the server · Zero Radar