CVE-2026-8670

Name: CVE-2026-8670
Creator: NVD / NIST
Published: 2026-05-22T14:16:29.64+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2026-8670 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. 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.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability

0.22%

11.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-613

Affected Software

Vendor	Product	Versions
Avantra	Avantra	< 25.3.1

References

https://support.avantra.com/hc/en-us/articles/5533929912351Mitigation, Vendor Advisory

Timeline

Published: May 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-8670?

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.

How severe is CVE-2026-8670?

CVE-2026-8670 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2026-8670?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-8670?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST