# CVE-2025-34026: Versa Networks Concerto authentication bypass in Traefik configuration

Source: https://junglewise.ai/threats/cve-2025-34026-versa-networks-concerto-authentication-bypass-in-traefik  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-22. Updated: 2026-05-15  
License: CC BY 4.0 with a link back

CVE-2025-34026 · Severity: critical · CVSS 9.2 · Exploited in the wild · Published 2026-01-22

Versa Concerto, a platform used to manage and orchestrate SD-WAN networks, contains a security flaw that allows unauthorized individuals to bypass login requirements. By exploiting this vulnerability, an attacker can access administrative interfaces and sensitive internal logs or system memory data. This could lead to the exposure of network configurations and credentials, potentially compromising the entire managed network infrastructure.

## Quick answers

**Is CVE-2025-34026 exploited in the wild?** Yes. CVE-2025-34026 is known to be exploited in the wild, first recorded on 22 January 2026. Treat it as urgent.

**How severe is CVE-2025-34026?** Critical severity, with a CVSS score of 9.2, published 22 January 2026.

**Which products and versions are affected?** Versa Networks Concerto 11.4.0 up to (excluding) 12.1.2, 12.1.2, 12.2.0.

**Is there a fix for CVE-2025-34026?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-34026 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-34026?** Check whether you run Versa Concerto. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An authentication bypass vulnerability (CWE-288) exists in Versa Concerto due to a misconfiguration in the Traefik reverse proxy. A remote, unauthenticated attacker can exploit this flaw over the network to reach administrative endpoints that should be protected. Specifically, attackers can access the internal Spring Boot Actuator endpoint, which can be leveraged to extract heap dumps and trace logs. This exposure can lead to the theft of sensitive session information or credentials. The vulnerability has been observed being exploited in the wild and affects versions 11.4.0 through 12.2.0.

## Affected products

- Versa Networks Concerto 11.4.0 up to (excluding) 12.1.2, 12.1.2, 12.2.0

## Timeline

- 2025-05-21: disclosed: Initial vulnerability report and NVD publication
- 2026-01-22: kev added: Added to CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-01-22: advisory: Vendor advisory published by Versa Networks