CVE-2026-49819

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-49819", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-01T18:50:36.055Z", "datePublished": "2026-08-12T23:13:46.298Z", "dateUpdated": "2026-08-13T13:08:59.003Z"}, "containers": {"cna": {"title": "UpSnap - Unauthenticated Initial-Superuser Takeover Chains to Root RCE via wake_cmd", "problemTypes": [{"descriptions": [{"cweId": "CWE-78", "lang": "en", "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-269", "lang": "en", "description": "CWE-269: Improper Privilege Management", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-306", "lang": "en", "description": "CWE-306: Missing Authentication for Critical Function", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-862", "lang": "en", "description": "CWE-862: Missing Authorization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-w4jr-728f-5jhq", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-w4jr-728f-5jhq"}, {"name": "https://github.com/seriousm4x/UpSnap/releases/tag/5.4.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/seriousm4x/UpSnap/releases/tag/5.4.0"}], "affected": [{"vendor": "seriousm4x", "product": "UpSnap", "versions": [{"version": ">= 4.4.1, < 5.4.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-12T23:13:46.298Z"}, "descriptions": [{"lang": "en", "value": "UpSnap is a wake on lan web app. Versions 4.4.1 through 5.3.5 are vulnerable to a missing-authentication / privilege-escalation chain in `pb.HandlerInitSuperuser` (`backend/pb/handlers.go:249`), reachable as `POST /api/upsnap/init-superuser`. The vulnerable code lacks any authentication, setup token, IP allow-list, or rate limit and is gated only by a `totalSuperusers > 0` count check \u2014 a condition that is false on every fresh install \u2014 allowing an unauthenticated network-adjacent attacker to register the initial superuser account, receive a long-lived JWT, and pivot to root remote code execution at `backend/networking/wake.go:43` (`exec.CommandContext(ctx, \"/bin/sh\", \"-c\", wake_cmd)`). Version 5.4.0 fixes the issue."}], "source": {"advisory": "GHSA-w4jr-728f-5jhq", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-w4jr-728f-5jhq", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-13T13:08:41.648461Z", "id": "CVE-2026-49819", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-13T13:08:59.003Z"}}]}}

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{"affected": [{"affectedData": [{"product": "UpSnap", "vendor": "seriousm4x", "versions": [{"status": "affected", "version": ">= 4.4.1, < 5.4.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "UpSnap is a wake on lan web app. Versions 4.4.1 through 5.3.5 are vulnerable to a missing-authentication / privilege-escalation chain in `pb.HandlerInitSuperuser` (`backend/pb/handlers.go:249`), reachable as `POST /api/upsnap/init-superuser`. The vulnerable code lacks any authentication, setup token, IP allow-list, or rate limit and is gated only by a `totalSuperusers > 0` count check \u2014 a condition that is false on every fresh install \u2014 allowing an unauthenticated network-adjacent attacker to register the initial superuser account, receive a long-lived JWT, and pivot to root remote code execution at `backend/networking/wake.go:43` (`exec.CommandContext(ctx, \"/bin/sh\", \"-c\", wake_cmd)`). Version 5.4.0 fixes the issue."}, {"lang": "es", "value": "UpSnap es una aplicaci\u00f3n web de wake on lan. Las versiones 4.4.1 a la 5.3.5 son vulnerables a una cadena de falta de autenticaci\u00f3n / escalada de privilegios en \u201cpb.HandlerInitSuperuser\u201d (\u201cbackend/pb/handlers.go:249\u201d), accesible como \u201cPOST /api/upsnap/init-superuser\u201d. El c\u00f3digo vulnerable carece de cualquier autenticaci\u00f3n, token de configuraci\u00f3n, lista de permitidos de IP, o l\u00edmite de tasa y est\u00e1 restringido solo por una verificaci\u00f3n de conteo \u201ctotalSuperusers mayor que 0\u201d - una condici\u00f3n que es falsa en cada instalaci\u00f3n nueva - permitiendo a un atacante adyacente a la red no autenticado registrar la cuenta de superusuario inicial, recibir un JWT de larga duraci\u00f3n, y pivotar a ejecuci\u00f3n remota de c\u00f3digo como root en \u201cbackend/networking/wake.go:43\u201d (\u201cexec.CommandContext(ctx, \u201c/bin/sh\u201d, \u201c-c\u201d, wake_cmd)\u201d). La versi\u00f3n 5.4.0 corrige el problema."}], "id": "CVE-2026-49819", "lastModified": "2026-10-24T16:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49819", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-13T13:08:41.648461Z", "version": "2.0.3"}}]}, "published": "2026-08-13T00:17:32.747", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/seriousm4x/UpSnap/releases/tag/5.4.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-w4jr-728f-5jhq"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-w4jr-728f-5jhq"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}, {"lang": "en", "value": "CWE-269"}, {"lang": "en", "value": "CWE-306"}, {"lang": "en", "value": "CWE-862"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.4.1,5.4.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "UpSnap", "source": "cna", "vendor": "seriousm4x"}, "product": "upsnap", "vendor": "seriousm4x"}], "created": "2026-08-13T02:00:13.140533+00:00", "updated": "2026-08-13T09:47:32.060526+00:00", "vendors": ["seriousm4x", "seriousm4x$PRODUCT$upsnap"]}