{"id":"GO-2026-5816","revision":null,"records":[{"revision":"dddaca5946774fb8a577c2cf8291ff0a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-49258","aliases":[],"title":"Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete)","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.","state":0,"publishedAt":"2026-07-28T18:52:58.713+00:00","modifiedAt":"2026-07-28T19:21:43.453+00:00","affected":[{"ecosystem":"Vendor product","name":"nebula-mesh","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"juev\",\n                    \"product\": \"nebula-mesh\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.3.6\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-c6v2-3ffm-vcmc","https://github.com/forgekeep/nebula-mesh/pull/161"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-49258","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-49258","identifiers":["CVE-2026-49258"]},"retained":false,"historicalAffected":[]},{"revision":"6b6c6b3177be45e18e8ae22bd5e05c4f","observedAt":"2026-10-25T12:17:32.273+00:00","statement":{"source":"nvd","id":"CVE-2026-49258","aliases":[],"title":"Nebula Mesh is a self-hosted control plane for the Slack Nebula mesh VPN. 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This issue has been fixed in version 0.3.6.","state":0,"publishedAt":"2026-07-28T19:17:36+00:00","modifiedAt":"2026-10-23T23:10:00.157+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/forgekeep/nebula-mesh/pull/161","https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-c6v2-3ffm-vcmc"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49258","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-639","CWE-862"],"productCriteria":[],"sourceDates":{"published":"2026-07-28T19:17:36.000","lastModified":"2026-10-23T23:10:00.157"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-49258","identifiers":["CVE-2026-49258"]},"retained":false,"historicalAffected":[]},{"revision":"b8142b82282d48b69cd2bbc21fd44e60","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-c6v2-3ffm-vcmc","aliases":["CVE-2026-49258","GO-2026-5816"],"title":"Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete)","description":"## Summary\n\nThe web UI (`/ui/*`) does not apply the per-operator CA scoping the JSON API received for GHSA-598g-h2vc-h5vg. Any authenticated non-admin operator (for example, one created via self-registration or OIDC) can access resources belonging to other operators.\n\n## Impact\n\nA non-admin operator can:\n\n- **Block or delete any other operator's host.** `POST /ui/hosts/{id}/block` and `DELETE /ui/hosts/{id}` act on the URL `id` with no ownership check, so a non-admin can block (revoking the host's certificate via the blocklist) or delete any host in the deployment — a cross-operator denial of service.\n- **Read every operator's hosts and networks.** The dashboard, `/ui/hosts`, the host detail page, `/ui/networks` (including the create-form error re-render), and the `/ui/events` stream all return data across all operators, exposing host names, Nebula IPs, public IPs, certificate fingerprints and expiry, and network names and CIDRs.\n\nThis is the same cross-operator class as GHSA-598g; that remediation covered the JSON API but not the web read/mutation surface. The host create/edit/mobile-bundle/network-create paths and all CA-management routes were already correctly scoped.\n\nAffected handlers (`internal/web`): `handleHostDetail`, `handleHostBlock`, `handleHostDelete`, `handleDashboard`, `handlePartialStats`, `handleHosts`, `handleNetworks`, `renderNetworksError`, `handleHostEvents`.\n\n## Conditions\n\nExposure requires at least one non-admin operator to exist (self-registration enabled, OIDC, or an admin-created user). A single-admin deployment with no additional operators is not affected.\n\n## Fix\n\nA complete candidate fix with regression tests is ready in a private repository shared with the maintainer (`ak2k/nebula-mesh-ghsa-web`, PR #1): scope these handlers to the session operator's owned CAs (admins keep the full view), mirroring the API's ownership checks.","state":0,"publishedAt":"2026-06-26T21:29:02+00:00","modifiedAt":"2026-07-07T16:11:03.9093+00:00","affected":[{"ecosystem":"Go","name":"github.com/juev/nebula-mesh","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"last_affected","version":"0.3.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/juev/nebula-mesh/security/advisories/GHSA-c6v2-3ffm-vcmc","https://github.com/juev/nebula-mesh"],"sourceUrl":"https://github.com/advisories/GHSA-c6v2-3ffm-vcmc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-c6v2-3ffm-vcmc","identifiers":["GHSA-c6v2-3ffm-vcmc","CVE-2026-49258","GO-2026-5816"]},"retained":false,"historicalAffected":[]},{"revision":"ec5342b591fd4ef890c2b9a07b6f1173","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5816","aliases":["CVE-2026-49258","GHSA-c6v2-3ffm-vcmc"],"title":"Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete) in github.com/juev/nebula-mesh","description":"Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete) in github.com/juev/nebula-mesh","state":0,"publishedAt":"2026-07-07T15:26:32+00:00","modifiedAt":"2026-07-07T16:00:21.3162465+00:00","affected":[{"ecosystem":"Go","name":"github.com/juev/nebula-mesh","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/juev/nebula-mesh/security/advisories/GHSA-c6v2-3ffm-vcmc"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5816","license":"OSV · upstream source license applies","key":"osv:GO-2026-5816","identifiers":["GO-2026-5816","CVE-2026-49258","GHSA-c6v2-3ffm-vcmc"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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