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CVE-2026-63464— Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`

Quick assessment

Affected
forgekeep nebula-mesh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nebula-mesh 是一个自托管的 Slack Nebula 网状 VPN 控制平面。从版本 0.6.0 到 0.7.2 之前，非管理员操作员（角色为 user）可以在其管理的 Webhook 订阅中设置 （通过 ）。该字段缺少管理员权限校验。在事件分发时，启用 会使调度器切换到一个无保护的 HTTP 客户端，从而绕过针对私有/回环/链路本地地址的 SSRF 防护机制——使得低权限操作员能够触发服务器向内网地址发起请求。该问题已在版本 0.7.2 中修复。

CVSS 7.7 · High

Possible ATT&CK Techniques 1 AI

T1210.003

Affected Version Matrix 1

VendorProduct Version RangeStatus
forgekeep nebula-mesh >= 0.6.0, < 0.7.2 affected
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I. Basic Information for CVE-2026-63464

Vulnerability Information
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Vulnerability Title
Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`
Source: CVE Program / CVE List V5
Vulnerability Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard — letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
forgekeep nebula-mesh >= 0.6.0, < 0.7.2 -

II. Public POCs for CVE-2026-63464

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III. Intelligence Information for CVE-2026-63464

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Patches & Fixes for CVE-2026-63464 (1)

Vendor Advisories for CVE-2026-63464 (1)

Vendor Pages for CVE-2026-63464 (1)

Same Patch Batch · forgekeep · 2026-09-04 · 7 CVEs total

CVE-2026-61699 8.1 HIGH nebula-mesh: Certificate revocation is never enforced at the mesh
CVE-2026-53603 7.1 HIGH nebula-mesh: Operator session tokens stored in plaintext in the database
CVE-2026-53604 7.1 HIGH nebula-mesh: CA private key not zeroized on web mobile-bundle error paths
CVE-2026-53602 6.9 MEDIUM nebula-mesh - Host revocation is not durable: blocked/offboarded hosts can regain a valid
CVE-2026-55513 5.4 MEDIUM nebula-mesh: Web UI host creation ignores configured enrollment token TTL and mints 24-hou
CVE-2026-55512 5.3 MEDIUM nebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entri

IV. Related Vulnerabilities

Same product: nebula-mesh
Same vendor: forgekeep
Same weakness: CWE-862

V. Comments for CVE-2026-63464

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