What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-08
• Weakness: CWE-862

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.

Affected products

• forgekeep nebula-mesh: from 0.6.0, < 0.7.2

References

• https://github.com/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60a8e93ff0
• https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.2
• https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76
• https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76

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