CVE-2026-40878

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{"affected": [{"affectedData": [{"product": "mailcow-dockerized", "vendor": "mailcow", "versions": [{"status": "affected", "version": "< 2026-03b"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the mailcow web interface passes the raw `$_SERVER['REQUEST_URI']` to Twig as a global template variable and renders it inside a JavaScript string literal in the `setLang()` helper of `base.twig`, relying on Twig's default HTML auto-escaping instead of the context-appropriate `js` escaping strategy. In addition, the `query_string()` Twig helper merges all current `$_GET` parameters into the language-switching links on the login page, so attacker-supplied parameters are reflected and preserved across navigation. Version 2026-03b fixes the vulnerability."}, {"lang": "es", "value": "mailcow: dockerized es una suite de groupware/correo electr\u00f3nico de c\u00f3digo abierto basada en docker. En versiones anteriores a 2026-03b, la interfaz web de mailcow pasa la variable \u2019$_SERVER[\u2019REQUEST_URI\u2019]\u2019 sin procesar a Twig como una variable de plantilla global y la renderiza dentro de un literal de cadena de JavaScript en el ayudante \u2019setLang()\u2019 de \u2019base.twig\u2019, confiando en el auto-escapado HTML predeterminado de Twig en lugar de la estrategia de escape \u2019js\u2019 apropiada para el contexto. Adem\u00e1s, el ayudante \u2019query_string()\u2019 de Twig fusiona todos los par\u00e1metros \u2019$_GET\u2019 actuales en los enlaces de cambio de idioma en la p\u00e1gina de inicio de sesi\u00f3n, por lo que los par\u00e1metros proporcionados por el atacante se reflejan y se conservan a trav\u00e9s de la navegaci\u00f3n. La versi\u00f3n 2026-03b soluciona la vulnerabilidad."}], "id": "CVE-2026-40878", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/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": "LOW", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40878", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-22T13:39:14.669308Z", "version": "2.0.3"}}]}, "published": "2026-04-21T20:17:01.403", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-xv9r-j862-5hqf"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2026-03b)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mailcow-dockerized", "source": "cna", "vendor": "mailcow"}, "product": "mailcow_dockerized", "vendor": "mailcow"}], "created": "2026-04-22T04:15:07.395876+00:00", "updated": "2026-06-18T09:00:16.733651+00:00", "vendors": ["mailcow", "mailcow$PRODUCT$mailcow_dockerized"]}