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CVE-2026-8670: avantra vulnerability
CVE-2026-8670: critical vulnerability affecting avantra. Check CVSS, KEV status, business impact and recommended administrator actions.
- CVSS
- 9.6 CRITICAL
- EPSS
- 12.15%
- Known exploited
- not in KEV
- Product
- avantra
What is known
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.
Business impact
Successful exploitation of CVE-2026-8670, a critical vulnerability (CVSS 9.6) affecting avantra, may affect the confidentiality, integrity or availability of the vulnerable environment. The exact impact depends on the installed version, exposed interfaces and deployment configuration.
Recommended administrator action
Confirm whether avantra is present and compare installed versions with the vendor advisory and NVD record. Apply the vendor patch or documented mitigation; until remediation is complete, reduce exposure of affected interfaces, review relevant logs and monitor for indicators of exploitation. DataHouse can support version verification, managed patching, network exposure reduction, log review and backup validation for dedicated, cloud and colocated environments.