CVE-2026-49258: high-severity vulnerability in juev nebula-mesh
Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete)
Published
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.5%
Nebula Mesh is a self-hosted control plane for the Slack Nebula mesh VPN. In versions 0.3.5 and below, the web UI (/ui/*) does not apply the per-operator CA scoping employed by the JSON API. This was partially addressed by GHSA-598g-h2vc-h5vg, but the changes were not implemented in the web read/mutation surface. Any authenticated non-admin operator (for example, one created via self-registration or OIDC) can access resources belonging to other operators. The host create/edit/mobile-bundle/network-create paths and all CA-management routes were already correctly scoped. A malicious operator could block or delete any other operator's host, or read any operator's hosts and networks. This issue has been fixed in version 0.3.6.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
juev · nebula-meshRelated CVEs — juev nebula-mesh
In the same product, most dangerous first.
CVE-2026-47723HIGHnebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)EPSS 0.5%CVE-2026-48025MEDIUMnebula-mesh: Decrypted CA private key persists in heap after signingEPSS 0.5%CVE-2026-47724CRITICALnebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalationEPSS 0.5%CVE-2026-47722HIGHnebula-mesh: Host advanced overrides allow YAML injection into agent config.ymlEPSS 0.5%CVE-2026-47726HIGHnebula-mesh: GET /api/v1/audit-log discloses all entries to any operatorEPSS 0.3%CVE-2026-48058MEDIUMnebula-mesh: Session and OIDC state cookies lack the Secure attributeEPSS 0.2%