# CVE-2025-34026: Versa Concerto Improper Authentication

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

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N`)
- **Exploited in the wild:** Yes, since 22 Jan 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 May 2025
- **Updated:** 23 Jan 2026
- **Also known as:** GHSA-h2mm-jj4p-hm2p

## 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 (Authentication Bypass Using an Alternate Path or Channel)

## Which versions are affected by CVE-2025-34026?

It affects 1 product.


Products: 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.

## 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:

- Versa Concerto Actuator Endpoint - Authentication Bypass (nuclei): http/cves/2025/CVE-2025-34026.yaml

## Other vulnerabilities in Versa Concerto

- [CVE-2025-34027](https://insights.sbomify.com/CVE-2025-34027/): Versa Concerto Authentication Bypass File Write Remote Code Execution (critical 10.0)
- [CVE-2025-34025](https://insights.sbomify.com/CVE-2025-34025/): Versa Concerto Insecure Docker Mount Container Escape (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34026 and fix it if it is affected.

What it is: 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.
Exploitation: Yes. Attackers have exploited CVE-2025-34026 in the wild since at least 22 Jan 2026.

Affected product: Versa Concerto. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-34026/ (Markdown: https://insights.sbomify.com/CVE-2025-34026/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34026
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34026
- OSV: https://osv.dev/vulnerability/CVE-2025-34026

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34026/
Summaries are generated and may contain mistakes; the official description above is the record.