High severity · published Jul 23, 2026
CVE-2026-47723
nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)
7.1
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
nebula-mesh · juev
< 0.3.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47723
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47723
github.com
https://github.com/forgekeep/nebula-mesh/commit/b45fda5476c41ffcff1ca23058aef0fb851359c1
github.com
https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.1
github.com
https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-w7w5-5gcp-38rw
More from nebula-mesh
9.9
CVE-2026-47724
nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation
8.8
CVE-2026-49258
Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete)
8.7
CVE-2026-47722
nebula-mesh: Host advanced overrides allow YAML injection into agent config.yml
7.1
CVE-2026-47726
nebula-mesh: GET /api/v1/audit-log discloses all entries to any operator
6.9
CVE-2026-47725
nebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints