CVE-2025-34026 Versa Concerto Improper Authentication

Exploited in the wild Critical 9.2 Published 21 May 2025 Updated 23 Jan 2026

Attackers can bypass authentication to access administrative endpoints and leak sensitive heap dumps and trace logs in Versa Concerto.

Exploited in the wild: Since 22 Jan 2026
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-34026?

CVE-2025-34026 is a critical authentication bypass vulnerability in Versa Concerto, published on 21 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication bypass in the Traefik reverse proxy configuration, allowing at attacker to access administrative endpoints. The internal Actuator endpoint can be leveraged for access to heap dumps and trace logs.This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable.

Weakness: CWE-288

Which versions are affected by CVE-2025-34026?

It affects 1 product.

Products include Versa-Networks Concerto.

How do I fix CVE-2025-34026?

No fix has been published for CVE-2025-34026 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 12 Feb 2026.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2025-34026 being exploited?

Yes. Attackers have exploited CVE-2025-34026 in the wild since at least 22 Jan 2026.

Public exploit code: 1 Nuclei template.

Sources

Also known as GHSA-h2mm-jj4p-hm2p.