Vulnerability · Published May 22, 2026 · Assigned by NCSC.ch
CVE-2026-8670Insecure session handling on metrics web server
Critical 9.6
In plain English
A critical-severity security flaw in Avantra from syslink software AG. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).
Severity (CVSS 3.1)9.6Critical
Exploit odds (30 days)0.2%top 87.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| syslink software AG | Avantra | 0 – before 25.3.1 |
Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
- https://support.avantra.com/hc/en-us/articles/5533929912351 vendor-advisory