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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63464
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 20:17:24 UTC
Updated2026-09-04 20:17:24 UTC
Descriptionnebula-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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Problem Types: CWE-862 | CWE-918 | CWE-862 CWE-862: Missing Authorization | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Forgekeep Nebula-mesh affected >= 0.6.0, < 0.7.2 Not specified

References

ReferenceSourceLinkTags
github.com/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60... [email protected] github.com
github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76 [email protected] github.com
github.com/forgekeep/nebula-mesh/releases/tag/v0.7.2 [email protected] github.com
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