CVE-2026-53593

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{"affected": [{"affectedData": [{"product": "freescout", "vendor": "freescout-help-desk", "versions": [{"status": "affected", "version": "< 1.8.224"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.224, the denylist that neutralizes dangerous file uploads (`Helper::$restricted_extensions`) is incomplete: it does not cover the `.pht` extension. The authenticated upload endpoint `POST /uploads/upload` (`SecureController@upload`) stores files with their original extension into the web-accessible directory `storage/app/public/uploads/` (served at `/storage/uploads/`). On the standard Apache + `libapache2-mod-php` deployment, the default handler `<FilesMatch \".+\\.ph(ar|p[3457]?|t|tml)$\">` executes `.pht`, so **any authenticated agent can upload a `.pht` web shell and run arbitrary commands as the web-server user** (`www-data`). This is a direct bypass of the fix for CVE-2025-48471, which added `phtml`/`phar` but not `pht` (nor `phtm`, `phps`). Version 1.8.224 contains an updated fix."}, {"lang": "es", "value": "FreeScout es una mesa de ayuda y bandeja de entrada compartida gratuita construida con el framework Laravel de PHP. Antes de la versi\u00f3n 1.8.224, la lista de denegaci\u00f3n que neutraliza las cargas de archivos peligrosos (\u2019Helper::$restricted_extensions\u2019) est\u00e1 incompleta: no cubre la extensi\u00f3n \u2019.pht\u2019. El endpoint de carga autenticado \u2019POST /uploads/upload\u2019 (\u2019SecureController@upload\u2019) almacena archivos con su extensi\u00f3n original en el directorio accesible por la web \u2019storage/app/public/uploads/\u2019 (servido en \u2019/storage/uploads/\u2019). En la implementaci\u00f3n est\u00e1ndar de Apache + \u2019libapache2-mod-php\u2019, el gestor predeterminado \u201c<FilesMatch \u201c.+\\.ph(ar|p[3457]?|t|tml)$\u201d>\u201d ejecuta \u2019.pht\u2019, por lo que cualquier agente autenticado puede cargar un web shell \u2019.pht\u2019 y ejecutar comandos arbitrarios como el usuario del servidor web (\u2019www-data\u2019). Esto es un bypass directo de la correcci\u00f3n para CVE-2025-48471, que a\u00f1adi\u00f3 \u2019phtml\u2019/\u2019phar\u2019 pero no \u2019pht\u2019 (ni \u2019phtm\u2019, \u2019phps\u2019). La versi\u00f3n 1.8.224 contiene una correcci\u00f3n actualizada."}], "id": "CVE-2026-53593", "lastModified": "2026-10-24T20:10:00.137", "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": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53593", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-21T13:21:02.831385Z", "version": "2.0.3"}}]}, "published": "2026-07-20T20:16:44.883", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-27vp-fpg8-j8wv"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-27vp-fpg8-j8wv"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-434"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.8.224)"}}], "enrichment": {"confidence": 98.0, "confidence_source": "matching", "scores": [{"score": 98.0, "source": "matching"}]}, "original": {"product": "freescout", "source": "cna", "vendor": "freescout-help-desk"}, "product": "freescout", "vendor": "freescout_helpdesk"}], "created": "2026-07-20T22:30:18.907073+00:00", "updated": "2026-07-30T18:45:06.935240+00:00", "vendors": ["freescout_helpdesk", "freescout_helpdesk$PRODUCT$freescout"]}