CVE-2026-63464

Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`

State: Published
Severity: 7.7 High
Published: Sep 4, 2026
Updated: Sep 8, 2026
Reserved: Jul 16, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-862 Missing Authorization
CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
nebula-meshforgekeep	>= 0.6.0, < 0.7.2Affected

References

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