CVE-2026-47723CWE-1021

nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)

High · published July 23, 2026

CVSS v4.0
7.1
EPSS
1%
Percentile
43.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00526 · 43.7th percentile
Weakness
CWE-1021 · Improper Restriction of Rendered UI Layers or Frames
Published
2026-07-23T20:17Z
EPSS history
Timeline
  • 23 JUL 20:17Z
    nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)
    cvelistv5