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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)

Quick assessment

Affected
juev nebula-mesh
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Forgekeep nebula-mesh是Forgekeep团队的一系列网络代理和VPN整合软件。 Forgekeep nebula-mesh 0.3.5及之前版本存在授权问题漏洞，该漏洞源于web UI未应用JSON API使用的per-operator CA作用域，导致任何经过身份验证的非管理员操作员可以访问其他操作员的资源，可能造成阻止或删除其他主机，或读取其他主机和网络。

CVSS 8.8 · High EPSS 0.48% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
juev nebula-mesh < 0.3.6 affected
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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
Vulnerability Title
Forgekeep nebula-mesh 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Forgekeep nebula-mesh是Forgekeep团队的一系列网络代理和VPN整合软件。 Forgekeep nebula-mesh 0.3.5及之前版本存在授权问题漏洞，该漏洞源于web UI未应用JSON API使用的per-operator CA作用域，导致任何经过身份验证的非管理员操作员可以访问其他操作员的资源，可能造成阻止或删除其他主机，或读取其他主机和网络。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
juev nebula-mesh < 0.3.6 -

II. Public POCs for CVE-2026-49258

# POC Description Source Link Shenlong Link
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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-2026-47726 7.1 HIGH nebula-mesh: GET /api/v1/audit-log discloses all entries to any operator
CVE-2026-48025 6.9 MEDIUM nebula-mesh: Decrypted CA private key persists in heap after signing
CVE-2026-47725 6.9 MEDIUM nebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints
CVE-2026-47768 5.5 MEDIUM nebula-mesh: Newly-minted operator API key exposed in redirect URL (Referer, history, prox
CVE-2026-48058 4.6 MEDIUM nebula-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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