How severe is CVE-2026-8673?

CVE-2026-8673 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-8673 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-8673?

CVE-2026-8673 affects Avantra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8673?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-8673 have an EU (EUVD) identifier?

Yes. CVE-2026-8673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31436.

When was CVE-2026-8673 published?

CVE-2026-8673 was published on 2026-05-22 and last updated on 2026-06-17.

CVE-2026-8673

CVE-2026-8673 is a medium-severity vulnerability in Avantra with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-523.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31436
Weakness: CWE-523
Affected product: Avantra
Published: 2026-05-22
Last modified: 2026-06-17

Description

Unprotected transport of credentials vulnerability in syslink software AG Avantra on Linux, Windows allows Sniffing Attacks. This issue affects Avantra: before 25.3.0.

Frequently asked questions

What is CVE-2026-8673?: Unprotected transport of credentials vulnerability in syslink software AG Avantra on Linux, Windows allows Sniffing Attacks. This issue affects Avantra: before 25.3.0.
How severe is CVE-2026-8673?: CVE-2026-8673 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-8673 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-8673?: CVE-2026-8673 affects Avantra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8673?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-8673 have an EU (EUVD) identifier?: Yes. CVE-2026-8673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31436.
When was CVE-2026-8673 published?: CVE-2026-8673 was published on 2026-05-22 and last updated on 2026-06-17.

References

https://support.avantra.com/hc/en-us/articles/5535621927071

Affected products (1)

cpe:2.3:a:avantra:avantra:*:*:*:*:*:*:*:*

More vulnerabilities in Avantra

CVE-2026-8670 — Critical (CVSS 9.6): Insufficient session expiration vulnerability in syslink software AG Avantra on Linux, Windows allows Reusing Session…
CVE-2026-8671 — High (CVSS 7.5): Insertion of sensitive information into log file vulnerability in syslink software AG Avantra on Linux, Windows allows…
CVE-2026-8672 — Medium (CVSS 5.1): Use of default password vulnerability in syslink software AG Avantra on Linux, Windows allows Try Common or Default…

All CVEs affecting Avantra →

Other CWE-523 vulnerabilities

CVE-2024-1509 — Critical (CVSS 9.1): Brocade ASCG before 3.2.0 Web Interface is not enforcing HSTS, as defined by RFC 6797. HSTS is an optional response…
CVE-2025-57800 — High (CVSS 8.8): Audiobookshelf is an open-source self-hosted audiobook server. In versions 2.6.0 through 2.26.3, the application does…
CVE-2025-61121 — High (CVSS 7.5): Mobile Scanner Android App version 2.12.38 (package name com.glority.everlens), developed by Glority Global Group Ltd.,…
CVE-2023-31277 — High (CVSS 7.5): PiiGAB M-Bus transmits credentials in plaintext format.
CVE-2022-31805 — High (CVSS 7.5): In the CODESYS Development System multiple components in multiple versions transmit the passwords for the communication…
CVE-2025-64309 — High (CVSS 7.4): The affected product discloses device telemetry, configuration, and sensitive information via WebSocket traffic to…

Browse all CWE-523 vulnerabilities →