CVE-2026-47723: CWE-1021: Improper Restriction of Rendered UI Layers or Frames in juev nebula-mesh
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.
AI Analysis
Technical Summary
CVE-2026-47723 describes a vulnerability in juev's nebula-mesh, a self-hosted control plane for the Slack Nebula mesh VPN. Before version 0.3.1, the application did not set critical browser security headers in any response paths under internal/web/ or internal/api/. The absence of headers like Content-Security-Policy and X-Frame-Options constitutes improper restriction of rendered UI layers or frames (CWE-1021), potentially exposing users to UI-based attacks. The issue is fixed in version 0.3.1.
Potential Impact
The lack of standard browser security headers can allow attackers to perform UI-based attacks such as clickjacking or content injection, potentially leading to user interface manipulation or information disclosure. The CVSS 4.0 score of 7.1 (high severity) reflects the network attack vector, low attack complexity, no privileges required, user interaction needed, and high impact on integrity and availability.
Mitigation Recommendations
Upgrade to nebula-mesh version 0.3.1 or later, where the issue is fixed by setting appropriate browser security headers. No other official remediation level or patch links are provided, but the vendor has addressed the vulnerability in this version.
CVE-2026-47723: CWE-1021: Improper Restriction of Rendered UI Layers or Frames in juev nebula-mesh
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.
CVSS v4.0
Score 7.1high
Affected software
pkg:github/forgekeep/nebula-meshRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47723 describes a vulnerability in juev's nebula-mesh, a self-hosted control plane for the Slack Nebula mesh VPN. Before version 0.3.1, the application did not set critical browser security headers in any response paths under internal/web/ or internal/api/. The absence of headers like Content-Security-Policy and X-Frame-Options constitutes improper restriction of rendered UI layers or frames (CWE-1021), potentially exposing users to UI-based attacks. The issue is fixed in version 0.3.1.
Potential Impact
The lack of standard browser security headers can allow attackers to perform UI-based attacks such as clickjacking or content injection, potentially leading to user interface manipulation or information disclosure. The CVSS 4.0 score of 7.1 (high severity) reflects the network attack vector, low attack complexity, no privileges required, user interaction needed, and high impact on integrity and availability.
Mitigation Recommendations
Upgrade to nebula-mesh version 0.3.1 or later, where the issue is fixed by setting appropriate browser security headers. No other official remediation level or patch links are provided, but the vendor has addressed the vulnerability in this version.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-19T21:29:25.482Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a62781b9c2644c7f8a7dd80
Added to database: 07/23/2026, 20:22:51 UTC
Last enriched: 07/30/2026, 23:01:48 UTC
Last updated: 09/05/2026, 10:52:10 UTC
Views: 87
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