CVE-2026-47723 nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)
The nebula-mesh control plane fails to set standard browser security headers, potentially allowing clickjacking or MIME sniffing attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-47723?
CVE-2026-47723 is a high-severity vulnerability in juev nebula-mesh, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.1, none of the response paths in `internal/web/` or `internal/api/` set the standard browser-security headers. `grep` for `Content-Security-Policy`, `X-Frame-Options`, `Strict-Transport-Security`, `X-Content-Type-Options`, `Referrer-Policy` returns zero matches across the codebase. Version 0.3.1 fixes the issue.
Weakness: CWE-1021
Which versions are affected by CVE-2026-47723?
3 open source packages ship an affected version, including github.com/juev/nebula-mesh.
| Package | Affected | Fixed in |
|---|---|---|
github.com/juev/nebula-mesh Go | All versions | 0.3.1 |
github.com/juev/nebula-mesh Go | All versions | 0.3.1 |
github.com/juev/nebula-mesh Go | All versions | 0.3.1 |
How do I fix CVE-2026-47723?
Upgrade github.com/juev/nebula-mesh to 0.3.1 or later.
Is CVE-2026-47723 being exploited?
There is no known exploitation of CVE-2026-47723 in the wild and no public exploit code.
Sources
Also known as GHSA-w7w5-5gcp-38rw, GO-2026-5698.