{"id":"CVE-2026-79667","state":"PUBLISHED","title":"Ech0 before 4.4.3 Authentication Bypass via Scope Enforcement","description":"Ech0 version 4.3.4 and earlier fails to reliably enforce scoped access token (least-privilege) restrictions on several privileged admin routes. Multiple privileged endpoints (e.g., /api/inbox, /api/panel/comments, /api/backup/export) omit scope checks and authorize based only on the user's admin role, and the backup export handler discards token scope metadata entirely. An attacker holding a deliberately limited (low-scope) admin access token can reach broader privileged functionality than intended, including reading the inbox and exporting a full database backup ZIP archive. 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Fixed in 4.4.3."}],"affected":[{"vendor":"lin-snow","product":"Ech0","packageURL":"pkg:golang/github.com/lin-snow/ech0","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.4.3","versionType":"semver"},{"version":"4.4.3","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/lin-snow/Ech0/security/advisories/GHSA-4h9q-p5j4-xvvh","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-4h9q-p5j4-xvvh)"},{"url":"https://www.vulncheck.com/advisories/ech0-before-authentication-bypass-via-scope-enforcement","name":"VulnCheck Advisory: Ech0 before 4.4.3 Authentication Bypass via Scope Enforcement","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"LOW","baseScore":7.6,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-285","lang":"en","description":"Improper Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-08-25T11:33:29.421Z"},"datePublic":"2026-04-09T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*","versionEndExcluding":"4.4.3"}]}]}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/lin-snow/Ech0/security/advisories/GHSA-4h9q-p5j4-xvvh","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T13:24:52.512404Z","id":"CVE-2026-79667","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-25T13:28:12.131Z"}}]}}}