CVE-2026-8670: Avantra

Critical severity, CVSS 9.6. EPSS: 0.4% chance of exploitation in the next 30 days.

Insufficient session expiration vulnerability in syslink software AG Avantra on Linux, Windows allows Reusing Session IDs (aka Session Replay). This issue affects Avantra: before 25.3.1.

Affected products

• Avantra Avantra: before 25.3.1 (fixed in 25.3.1)

Published 2026-05-22. Last modified 2026-07-23.