CVE-2026-78553

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The <code>secret_key</code> file was created using the process's default permissions and umask, resulting in permissions such as <code>0644</code> under a common <code>022</code> umask. Consequently, other local users able to access the RansomLook home directory could read the application's cryptographic secret.</p>\n<p>The exposed key is security-critical because it is used to sign Flask session cookies and is also involved in the legacy API-key key derivation. An attacker who obtains the key can generate valid session cookies and impersonate an authenticated user, including an administrator. In LDAP configurations, exploitation may be particularly straightforward because the session user loader does not require the supplied username to correspond to an existing local user.</p>\n<p>Successful exploitation requires local access sufficient to read the improperly protected file, but can result in complete compromise of RansomLook's authentication and authorization controls.</p>\n<p>The patch creates new secret-key files atomically with permissions <code>0600</code> and also restricts permissions on existing key files during application startup.</p><br>"}], "value": "RansomLook created its Flask session-signing key without explicitly restricting the file permissions. The secret_key file was created using the process's default permissions and umask, resulting in permissions such as 0644 under a common 022 umask. Consequently, other local users able to access the RansomLook home directory could read the application's cryptographic secret.\n\n\nThe exposed key is security-critical because it is used to sign Flask session cookies and is also involved in the legacy API-key key derivation. An attacker who obtains the key can generate valid session cookies and impersonate an authenticated user, including an administrator. In LDAP configurations, exploitation may be particularly straightforward because the session user loader does not require the supplied username to correspond to an existing local user.\n\n\nSuccessful exploitation requires local access sufficient to read the improperly protected file, but can result in complete compromise of RansomLook's authentication and authorization controls.\n\n\nThe patch creates new secret-key files atomically with permissions 0600 and also restricts permissions on existing key files during application startup."}], "impacts": [{"capecId": "CAPEC-180", "descriptions": [{"lang": "en", "value": "CAPEC-180 Exploiting Incorrectly Configured Access Control Security Levels"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "baseScore": 7, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-276", "description": "CWE-276 Incorrect Default Permissions", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-732", "description": "CWE-732 Incorrect Permission Assignment for Critical Resource", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "shortName": "CIRCL", "dateUpdated": "2026-08-24T19:28:49.323Z"}, "references": [{"tags": ["patch"], "url": "https://github.com/RansomLook/RansomLook/commit/df9d47edcf02dd0125db869d5bc19d93f426d892"}], "source": {"discovery": "UNKNOWN"}, "title": "Insecure Flask Secret-Key File Permissions Allow Local Administrator Session Forgery in RansomLook", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-24T20:06:47.525354Z", "id": "CVE-2026-78553", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-08-24T20:07:07.041Z"}}]}}

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The secret_key file was created using the process's default permissions and umask, resulting in permissions such as 0644 under a common 022 umask. Consequently, other local users able to access the RansomLook home directory could read the application's cryptographic secret.\n\n\nThe exposed key is security-critical because it is used to sign Flask session cookies and is also involved in the legacy API-key key derivation. An attacker who obtains the key can generate valid session cookies and impersonate an authenticated user, including an administrator. In LDAP configurations, exploitation may be particularly straightforward because the session user loader does not require the supplied username to correspond to an existing local user.\n\n\nSuccessful exploitation requires local access sufficient to read the improperly protected file, but can result in complete compromise of RansomLook's authentication and authorization controls.\n\n\nThe patch creates new secret-key files atomically with permissions 0600 and also restricts permissions on existing key files during application startup.", "supportingMedia": [{"type": "text/html", "value": "<p>RansomLook created its Flask session-signing key without explicitly restricting the file permissions. The <code>secret_key</code> file was created using the process's default permissions and umask, resulting in permissions such as <code>0644</code> under a common <code>022</code> umask. Consequently, other local users able to access the RansomLook home directory could read the application's cryptographic secret.</p>\n<p>The exposed key is security-critical because it is used to sign Flask session cookies and is also involved in the legacy API-key key derivation. An attacker who obtains the key can generate valid session cookies and impersonate an authenticated user, including an administrator. In LDAP configurations, exploitation may be particularly straightforward because the session user loader does not require the supplied username to correspond to an existing local user.</p>\n<p>Successful exploitation requires local access sufficient to read the improperly protected file, but can result in complete compromise of RansomLook's authentication and authorization controls.</p>\n<p>The patch creates new secret-key files atomically with permissions <code>0600</code> and also restricts permissions on existing key files during application startup.</p><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-276", "description": "CWE-276 Incorrect Default Permissions"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-732", "description": "CWE-732 Incorrect Permission Assignment for Critical Resource"}]}], "providerMetadata": {"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "shortName": "CIRCL", "dateUpdated": "2026-08-24T19:28:49.323Z"}}}, "cveMetadata": {"cveId": "CVE-2026-78553", "state": "PUBLISHED", "dateUpdated": "2026-08-24T20:07:07.041Z", "dateReserved": "2026-08-24T19:28:46.092Z", "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "datePublished": "2026-08-24T19:28:49.323Z", "assignerShortName": "CIRCL"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "ransomlook", "repo": "https://github.com/RansomLook/RansomLook", "vendor": "ransomlook", "versions": [{"lessThanOrEqual": "2.0.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "RansomLook created its Flask session-signing key without explicitly restricting the file permissions. The secret_key file was created using the process's default permissions and umask, resulting in permissions such as 0644 under a common 022 umask. Consequently, other local users able to access the RansomLook home directory could read the application's cryptographic secret.\n\n\nThe exposed key is security-critical because it is used to sign Flask session cookies and is also involved in the legacy API-key key derivation. An attacker who obtains the key can generate valid session cookies and impersonate an authenticated user, including an administrator. In LDAP configurations, exploitation may be particularly straightforward because the session user loader does not require the supplied username to correspond to an existing local user.\n\n\nSuccessful exploitation requires local access sufficient to read the improperly protected file, but can result in complete compromise of RansomLook's authentication and authorization controls.\n\n\nThe patch creates new secret-key files atomically with permissions 0600 and also restricts permissions on existing key files during application startup."}, {"lang": "es", "value": "RansomLook cre\u00f3 su clave de firma de sesi\u00f3n de Flask sin restringir expl\u00edcitamente los permisos de archivo. El archivo secret_key fue creado usando los permisos predeterminados y el umask del proceso, resultando en permisos como 0644 bajo un umask com\u00fan de 022. Consecuentemente, otros usuarios locales capaces de acceder al directorio de inicio de RansomLook pod\u00edan leer el secreto criptogr\u00e1fico de la aplicaci\u00f3n.\n\nLa clave expuesta es cr\u00edtica para la seguridad porque se usa para firmar cookies de sesi\u00f3n de Flask y tambi\u00e9n est\u00e1 involucrada en la derivaci\u00f3n de clave de API-key heredada. Un atacante que obtiene la clave puede generar cookies de sesi\u00f3n v\u00e1lidas e impersonar a un usuario autenticado, incluyendo un administrador. En configuraciones LDAP, la explotaci\u00f3n puede ser particularmente sencilla porque el cargador de usuarios de sesi\u00f3n no requiere que el nombre de usuario suministrado corresponda a un usuario local existente.\n\nLa explotaci\u00f3n exitosa requiere acceso local suficiente para leer el archivo indebidamente protegido, pero puede resultar en un compromiso completo de los controles de autenticaci\u00f3n y autorizaci\u00f3n de RansomLook.\n\nEl parche crea nuevos archivos de clave secreta at\u00f3micamente con permisos 0600 y tambi\u00e9n restringe los permisos en archivos de clave existentes durante el inicio de la aplicaci\u00f3n."}], "id": "CVE-2026-78553", "lastModified": "2026-10-12T21:10:00.227", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.0, "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/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": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-78553", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-24T20:06:47.525354Z", "version": "2.0.3"}}]}, "published": "2026-08-24T20:17:24.383", "references": [{"source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "url": "https://github.com/RansomLook/RansomLook/commit/df9d47edcf02dd0125db869d5bc19d93f426d892"}], "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-276"}, {"lang": "en", "value": "CWE-732"}], "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.0.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "ransomlook", "source": "cna", "vendor": "ransomlook"}, "product": "ransomlook", "vendor": "ransomlook"}], "created": "2026-08-24T20:30:07.132212+00:00", "updated": "2026-08-24T21:00:13.109516+00:00", "vendors": ["ransomlook", "ransomlook$PRODUCT$ransomlook"]}