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CVE-2026-49258— Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete)

CVSS 8.8 · High

Affected Version Matrix 1

VendorProductVersion RangeStatus
juevnebula-mesh< 0.3.6affected
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I. Basic Information for CVE-2026-49258

Vulnerability Information
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Vulnerability Title
Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
juevnebula-mesh < 0.3.6 -

II. Public POCs for CVE-2026-49258

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 5317 chars
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III. Intelligence Information for CVE-2026-49258

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Patches & Fixes for CVE-2026-49258 (1)

Vendor Advisories for CVE-2026-49258 (1)

Same Patch Batch · juev · 2026-07-28 · 6 CVEs total

CVE-2026-477267.1 HIGHnebula-mesh: GET /api/v1/audit-log discloses all entries to any operator
CVE-2026-480256.9 MEDIUMnebula-mesh: Decrypted CA private key persists in heap after signing
CVE-2026-477256.9 MEDIUMnebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints
CVE-2026-477685.5 MEDIUMnebula-mesh: Newly-minted operator API key exposed in redirect URL (Referer, history, prox
CVE-2026-480584.6 MEDIUMnebula-mesh: Session and OIDC state cookies lack the Secure attribute

IV. Related Vulnerabilities

Same product: nebula-mesh
Same vendor: juev
Same weakness: CWE-639

V. Comments for CVE-2026-49258

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