{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33638", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-23T14:24:11.619Z", "datePublished": "2026-03-26T20:52:40.464Z", "dateUpdated": "2026-03-27T20:19:07.459Z"}, "containers": {"cna": {"title": "Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint", "problemTypes": [{"descriptions": [{"cweId": "CWE-862", "lang": "en", "description": "CWE-862: Missing Authorization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj"}, {"name": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681", "tags": ["x_refsource_MISC"], "url": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681"}, {"name": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0"}], "affected": [{"vendor": "lin-snow", "product": "Ech0", "versions": [{"version": "< 4.2.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-26T20:52:40.464Z"}, "descriptions": [{"lang": "en", "value": "Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0."}], "source": {"advisory": "GHSA-m983-7426-5hrj", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-27T20:18:24.196051Z", "id": "CVE-2026-33638", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-27T20:19:07.459Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-33638", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-27T20:18:24.196051Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-27T20:18:44.481Z"}}], "cna": {"title": "Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint", "source": {"advisory": "GHSA-m983-7426-5hrj", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "lin-snow", "product": "Ech0", "versions": [{"status": "affected", "version": "< 4.2.0"}]}], "references": [{"url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj", "name": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681", "name": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0", "name": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-862", "description": "CWE-862: Missing Authorization"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-26T20:52:40.464Z"}}}, "cveMetadata": {"cveId": "CVE-2026-33638", "state": "PUBLISHED", "dateUpdated": "2026-03-27T20:19:07.459Z", "dateReserved": "2026-03-23T14:24:11.619Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-03-26T20:52:40.464Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*", "matchCriteriaId": "10A3DFF1-8E0A-435D-BD3D-1615E472D006", "versionEndExcluding": "4.2.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0."}, {"lang": "es", "value": "Ech0 es una plataforma de publicaci\u00f3n de c\u00f3digo abierto y autoalojada para compartir ideas personales. Antes de la versi\u00f3n 4.2.0, `GET /api/allusers` est\u00e1 montado como un endpoint p\u00fablico y devuelve registros de usuario sin autenticaci\u00f3n. Esto permite la enumeraci\u00f3n remota de usuarios no autenticados y la exposici\u00f3n de metadatos de perfil de usuario. Una soluci\u00f3n est\u00e1 disponible en la v4.2.0."}], "id": "CVE-2026-33638", "lastModified": "2026-03-31T21:09:16.307", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-26T21:17:07.467", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-862"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.2.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Ech0", "source": "cna", "vendor": "lin-snow"}, "product": "ech0", "vendor": "lin-snow"}], "analysis": {"en": {"generated_at": "2026-04-01T06:17:18.598060+00:00", "value": {"mitigation_remediation": ["Apply Ech0 update to v4.2.0 or later", "Restrict GET /api/allusers to authenticated users if patch cannot be applied", "Verify deployed version and audit configuration", "Monitor access logs for enumeration patterns"], "summary": {"action": "Immediate Patch", "impact": "Unauthenticated user enumeration exposing personal data"}, "threat_synthesis": {"affected_systems": "The Ech0 open\u2011source publishing platform, versions prior to v4.2.0, is affected; the vulnerable product is Ech0, hosted by lin\u2011snow, and any deployment running an unpatched instance of Ech0 before the v4.2.0 release can be impacted.", "description_and_impact": "An unauthenticated GET request to the public /api/allusers endpoint returns full user records, exposing personal profile details such as usernames and metadata; the flaw is a missing authentication check (CWE-862) that allows remote users to enumerate accounts without credentials, potentially enabling social engineering or identity theft but does not provide code execution or data modification rights.", "risk_and_exploitability": "The vulnerability has a CVSS base score of 5.3 indicating moderate severity; the EPSS score is below 1% suggesting low likelihood of exploitation, and it is not present in the CISA KEV catalog; the attack vector is remote over HTTP/HTTPS, requiring no local privileges, and exploitation yields exposure of all user records but no alteration or code execution capabilities."}}}}, "created": "2026-03-27T08:31:54.999216+00:00", "updated": "2026-04-02T07:56:19.443585+00:00", "vendors": ["lin-snow", "lin-snow$PRODUCT$ech0"]}