CVE-2025-50891: Adform Server-Side Backend For Site Tracking

High severity, CVSS 7.2. EPSS: 0.4% chance of exploitation in the next 30 days.

The server-side backend for Adform Site Tracking before 2025-08-28 allows attackers to inject HTML or execute arbitrary code via cookie hijacking. NOTE: a customer does not need to take any action to update locally installed software (such as Adform Site Tracking 1.1).

Affected products

• Adform Server-Side Backend For Site Tracking: before 2025-08-28 (fixed in 2025-08-28)

Published 2025-08-19. Last modified 2026-06-17.