CVE-2026-55676

{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2026-55676", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-17T00:05:03.778Z", "datePublished": "2026-08-11T20:24:50.803Z", "dateUpdated": "2026-10-02T20:20:14.228Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2026-10-02T20:20:14.228Z"}, "title": "Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-434", "description": "CWE-434: Unrestricted Upload of File with Dangerous Type", "type": "CWE"}]}], "affected": [{"vendor": "cisagov", "product": "Malcolm", "versions": [{"status": "affected", "version": "< 26.06.1"}, {"status": "unaffected", "version": "26.06.1"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restrict accepted file types is an empty array by default (`file-upload/php/config.php:16`), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the `.php` extension intact. Committed files land in `/var/www/upload/server/php/files` (`file-upload/php/config.php:7`), and the component's nginx routes any URL ending in `.php` to php-fpm. An authenticated `GET /server/php/files/<name>.php` then executes the uploaded code as `www-data`. Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular `ROLE_UPLOAD` role (`nginx/lua/nginx_auth_helpers.lua:71`), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as `www-data` inside the file-upload container. Version 26.06.1 fixes the issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restrict accepted file types is an empty array by default (`file-upload/php/config.php:16`), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the `.php` extension intact. Committed files land in `/var/www/upload/server/php/files` (`file-upload/php/config.php:7`), and the component's nginx routes any URL ending in `.php` to php-fpm. An authenticated `GET /server/php/files/&lt;name&gt;.php` then executes the uploaded code as `www-data`. Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular `ROLE_UPLOAD` role (`nginx/lua/nginx_auth_helpers.lua:71`), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as `www-data` inside the file-upload container. Version 26.06.1 fixes the issue.</p>"}]}], "references": [{"url": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-8cvp-m7pg-qrp7", "name": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-8cvp-m7pg-qrp7", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/cisagov/Malcolm/releases/tag/v26.06.1", "name": "https://github.com/cisagov/Malcolm/releases/tag/v26.06.1", "tags": ["x_refsource_MISC"]}, {"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01"}, {"url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}], "solutions": [{"lang": "en", "value": "Malcolm version 26.06.1 addresses this issue. For more information, see\u00a0 https://github.com/cisagov/Malcolm/pull/1026", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Malcolm version 26.06.1 addresses this issue. For more information, see&nbsp;<a href=\"https://github.com/cisagov/Malcolm/pull/1026\">https://github.com/cisagov/Malcolm/pull/1026</a>"}]}], "credits": [{"lang": "en", "value": "kah-ja, DeathRipper21 reported CVE-2026-55676 to CISA.", "type": "finder"}], "source": {"advisory": "GHSA-8cvp-m7pg-qrp7", "discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-12T22:09:13.650474Z", "id": "CVE-2026-55676", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-08-12T22:13:05.815Z"}}]}, "dataVersion": "5.2"}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55676", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-08-12T22:09:13.650474Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-12T22:09:15.579Z"}}], "cna": {"title": "Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component", "source": {"advisory": "GHSA-8cvp-m7pg-qrp7", "discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "kah-ja, DeathRipper21 reported CVE-2026-55676 to CISA."}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "cisagov", "product": "Malcolm", "versions": [{"status": "affected", "version": "< 26.06.1"}, {"status": "unaffected", "version": "26.06.1"}], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Malcolm version 26.06.1 addresses this issue. For more information, see\u00a0 https://github.com/cisagov/Malcolm/pull/1026", "supportingMedia": [{"type": "text/html", "value": "Malcolm version 26.06.1 addresses this issue. For more information, see&nbsp;<a href=\"https://github.com/cisagov/Malcolm/pull/1026\">https://github.com/cisagov/Malcolm/pull/1026</a>", "base64": false}]}], "references": [{"url": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-8cvp-m7pg-qrp7", "name": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-8cvp-m7pg-qrp7", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/cisagov/Malcolm/releases/tag/v26.06.1", "name": "https://github.com/cisagov/Malcolm/releases/tag/v26.06.1", "tags": ["x_refsource_MISC"]}, {"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01"}, {"url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json"}], "x_generator": {"engine": "Vulnogram 1.0.5"}, "descriptions": [{"lang": "en", "value": "Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restrict accepted file types is an empty array by default (`file-upload/php/config.php:16`), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the `.php` extension intact. Committed files land in `/var/www/upload/server/php/files` (`file-upload/php/config.php:7`), and the component's nginx routes any URL ending in `.php` to php-fpm. An authenticated `GET /server/php/files/<name>.php` then executes the uploaded code as `www-data`. Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular `ROLE_UPLOAD` role (`nginx/lua/nginx_auth_helpers.lua:71`), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as `www-data` inside the file-upload container. Version 26.06.1 fixes the issue.", "supportingMedia": [{"type": "text/html", "value": "<p>Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restrict accepted file types is an empty array by default (`file-upload/php/config.php:16`), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the `.php` extension intact. Committed files land in `/var/www/upload/server/php/files` (`file-upload/php/config.php:7`), and the component's nginx routes any URL ending in `.php` to php-fpm. An authenticated `GET /server/php/files/&lt;name&gt;.php` then executes the uploaded code as `www-data`. Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular `ROLE_UPLOAD` role (`nginx/lua/nginx_auth_helpers.lua:71`), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as `www-data` inside the file-upload container. Version 26.06.1 fixes the issue.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-434", "description": "CWE-434: Unrestricted Upload of File with Dangerous Type"}]}], "providerMetadata": {"orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2026-10-02T20:20:14.228Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55676", "state": "PUBLISHED", "dateUpdated": "2026-10-02T20:20:14.228Z", "dateReserved": "2026-06-17T00:05:03.778Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-08-11T20:24:50.803Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Malcolm", "vendor": "cisagov", "versions": [{"status": "affected", "version": "< 26.06.1"}, {"status": "unaffected", "version": "26.06.1"}]}], "source": "ics-cert@hq.dhs.gov"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restrict accepted file types is an empty array by default (`file-upload/php/config.php:16`), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the `.php` extension intact. Committed files land in `/var/www/upload/server/php/files` (`file-upload/php/config.php:7`), and the component's nginx routes any URL ending in `.php` to php-fpm. An authenticated `GET /server/php/files/<name>.php` then executes the uploaded code as `www-data`. Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular `ROLE_UPLOAD` role (`nginx/lua/nginx_auth_helpers.lua:71`), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as `www-data` inside the file-upload container. Version 26.06.1 fixes the issue."}, {"lang": "es", "value": "Malcolm es un conjunto de herramientas de an\u00e1lisis de tr\u00e1fico de red. El componente de carga de archivos (backend PHP de FilePond) acepta cargas en POST /server/php/submit.php y las almacena en un directorio servido por la misma instancia de nginx y php-fpm. La lista de permitidos que deber\u00eda restringir los tipos de archivo aceptados es un array vac\u00edo por defecto (file-upload/php/config.php:16), por lo que la verificaci\u00f3n de tipo es una operaci\u00f3n nula y cada extensi\u00f3n es aceptada. El saneador de nombres de archivo mantiene la extensi\u00f3n .php intacta. Los archivos confirmados aterrizan en /var/www/upload/server/php/files (file-upload/php/config.php:7), y el nginx del componente enruta cualquier URL que termine en .php a php-fpm. Un GET /server/php/files/[name].php autenticado luego ejecuta el c\u00f3digo cargado como www-data. Antes de la versi\u00f3n 26.06.1, en modo RBAC, el endpoint de carga es accesible por el rol granular ROLE_UPLOAD (nginx/lua/nginx_auth_helpers.lua:71), un rol destinado solo para enviar archivos de captura. Como resultado, un usuario con el rol de solo carga ejecuta PHP arbitrario como www-data dentro del contenedor de carga de archivos. La versi\u00f3n 26.06.1 corrige el problema."}], "id": "CVE-2026-55676", "lastModified": "2026-10-24T16:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "ics-cert@hq.dhs.gov", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "ics-cert@hq.dhs.gov", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55676", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-12T22:09:13.650474Z", "version": "2.0.3"}}]}, "published": "2026-08-11T21:17:37.560", "references": [{"source": "ics-cert@hq.dhs.gov", "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json"}, {"source": "ics-cert@hq.dhs.gov", "url": "https://github.com/cisagov/Malcolm/releases/tag/v26.06.1"}, {"source": "ics-cert@hq.dhs.gov", "url": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-8cvp-m7pg-qrp7"}, {"source": "ics-cert@hq.dhs.gov", "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01"}], "sourceIdentifier": "ics-cert@hq.dhs.gov", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-434"}], "source": "ics-cert@hq.dhs.gov", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,26.06.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Malcolm", "source": "cna", "vendor": "cisagov"}, "product": "malcolm", "vendor": "cisagov"}], "created": "2026-08-12T20:15:03.498354+00:00", "updated": "2026-10-02T22:00:24.613923+00:00", "vendors": ["cisagov", "cisagov$PRODUCT$malcolm"]}