nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)
Priority LOW 32CWE-1021Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1021.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00526 44th percentileScored 2026-11-07
Fix Fixed nebula-mesh (juev): 0.3.1github.com/juev/nebula-mesh (Go): 0.3.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| juev | nebula-mesh | before 0.3.1 | 0.3.1 | Patch available | CNA |
| — | github.com/juev/nebula-mesh (Go) | before 0.3.1 | 0.3.1 | Patch available | GHSA-w7w5-5gcp-38rw |
- nebula-mesh Vendorjuev Affected before 0.3.1 Fixed in 0.3.1 Patch available CNA
- github.com/juev/nebula-mesh (Go) Vendor— Affected before 0.3.1 Fixed in 0.3.1 Patch available GHSA-w7w5-5gcp-38rw
Remediation
- Fix · CNA nebula-mesh (juev) Fixed in 0.3.1
- Fix · GHSA-w7w5-5gcp-38rw github.com/juev/nebula-mesh (Go) Fixed in 0.3.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-47723
- 2026-10-03 Alias added: GHSA-w7w5-5gcp-38rw
References
Other 5
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-w7w5-5gcp-38rw
- https://github.com/forgekeep/nebula-mesh/commit/b45fda5476c41ffcff1ca23058aef0fb851359c1
- https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.1
- https://github.com/juev/nebula-mesh/security/advisories/GHSA-w7w5-5gcp-38rw
- https://github.com/juev/nebula-mesh
More juev vulnerabilities
- TI-2026-35226 nebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints CVSS 4.0MEDIUM 6.9
- TI-2026-35227 nebula-mesh: GET /api/v1/audit-log discloses all entries to any operator CVSS 4.0HIGH 7.1
- TI-2026-35499 nebula-mesh: Session and OIDC state cookies lack the Secure attribute CVSS 4.0MEDIUM 4.6
- TI-2026-35225 nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation CVSS 3.1CRITICAL 9.9
- TI-2026-36454 Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete) CVSS 3.1HIGH 8.8
- TI-2026-35223 nebula-mesh: Host advanced overrides allow YAML injection into agent config.yml CVSS 4.0HIGH 8.7
Sources
- CVE-2026-47723 · CVE Program
- CVE-2026-47723 · NVD
- FIRST EPSS
- GHSA-w7w5-5gcp-38rw · GitHub Advisory Database · CC BY 4.0
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