CVE-2026-57916: Asseco Procertum Smartsign

Medium severity, CVSS 4.6. EPSS: 0.1% chance of exploitation in the next 30 days.

proCertum SmartSign opens Certificate Practice Statement (CPS) URI without schema validation. An attacker can prepare arbitrary certificate with CPS URI pointing to a local executable file or any URL, sign a document with it, and send it to the victim. When the victim opens the document in the application, the specified file will be executed (or webpage will be opened). This issue was fixed in version 9.4.3.90.

Affected products

• Asseco Procertum Smartsign: before 9.4.3.90 (fixed in 9.4.3.90)

Published 2026-07-27. Last modified 2026-07-30.