Watching for Exploitation of the Adobe Campaign Classic Flaws While the Patch Is Pending
Eighteen critical Adobe Campaign Classic vulnerabilities were fixed in September 2026, but patching takes time in real change windows. That gap is where monitoring has to carry the load, and it starts with knowing what the public record actually offers as an indicator.
What the public record gives you
NCSC-NL advisory NCSC-2026-0393 of 24 September 2026, with Adobe bulletin APSB26-142, lists OS command injection, SQL injection, code injection, incorrect authorization, server-side request forgery and insufficient input validation as the affected classes. It records that ten flaws need no authentication and that CVE-2026-75699 scores 10.0. It does not publish payloads, endpoints or exploitation steps, so signature work has to come from category behaviour rather than from a provided indicator list.
Alerting on category behaviour
For the injection classes, unusual query construction and unexpected shell or process activity in the application log are worth alerting on. For the authorization class, successful requests to privileged functions from unexpected sources stand out. For server-side request forgery, outbound connections from the platform to internal addresses that it does not normally contact are the useful signal. These are monitoring principles for the listed weakness classes, not a published detection rule set.
Telemetry to preserve
Application and web server logs, outbound connection records from the platform hosts, and authentication audit trails all matter here. A 10.0 unauthenticated flaw produces activity before any login event, so control failures visible only after authentication will not show it.
Network controls that buy time
Where the upgrade is scheduled but not yet applied, limiting who can reach the Campaign Classic endpoints is the strongest available control. Restricting administrative interfaces to trusted networks and narrowing outbound access reduce both initial access and any post-exploitation movement.
What the patch still fixes
The fixed release is Campaign Classic 7.4.4 build 9402. Hosted environments are reported as already updated. Detection is a bridge to that state, not an alternative to it.
Exposure evidence
ZoomEye reported 142 assets matching title="Adobe Campaign" when checked, and no indexed assets for vul.cve="CVE-2026-75699". The fingerprint count describes deployed product instances rather than vulnerable hosts.
References
- NCSC-NL advisory NCSC-2026-0393: https://advisories.ncsc.nl/2026/ncsc-2026-0393.html
- Adobe Security Bulletin APSB26-142: https://helpx.adobe.com/security/products/campaign/apsb26-142.html
- ZoomEye product-title search: https://www.zoomeye.ai/searchResult?q=dGl0bGU9IkFkb2JlIENhbXBhaWduIg%3D%3D
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