CVE-2021-23393

{"containers": {"cna": {"affected": [{"product": "Flask-Unchained", "vendor": "n/a", "versions": [{"lessThan": "0.9.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "Noam Moshe of Claroty"}], "datePublic": "2021-06-10T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\\\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "exploitCodeMaturity": "PROOF_OF_CONCEPT", "integrityImpact": "LOW", "privilegesRequired": "NONE", "remediationLevel": "UNAVAILABLE", "reportConfidence": "CONFIRMED", "scope": "UNCHANGED", "temporalScore": 5.1, "temporalSeverity": "MEDIUM", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:U/RC:C", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"description": "Open Redirect", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-06-10T23:20:10.000Z", "orgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730", "shortName": "snyk"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40"}], "title": "Open Redirect", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "report@snyk.io", "DATE_PUBLIC": "2021-06-10T23:16:36.336782Z", "ID": "CVE-2021-23393", "STATE": "PUBLIC", "TITLE": "Open Redirect"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Flask-Unchained", "version": {"version_data": [{"version_affected": "<", "version_value": "0.9.0"}]}}]}, "vendor_name": "n/a"}]}}, "credit": [{"lang": "eng", "value": "Noam Moshe of Claroty"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\\\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:U/RC:C", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Open Redirect"}]}]}, "references": {"reference_data": [{"name": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189", "refsource": "MISC", "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189"}, {"name": "https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40", "refsource": "MISC", "url": "https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T19:05:55.795Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40"}]}]}, "cveMetadata": {"assignerOrgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730", "assignerShortName": "snyk", "cveId": "CVE-2021-23393", "datePublished": "2021-06-10T23:20:10.252Z", "dateReserved": "2021-01-08T00:00:00.000Z", "dateUpdated": "2024-09-16T17:18:13.774Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "Flask-Unchained", "vendor": "n/a", "versions": [{"lessThan": "0.9.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "report@snyk.io"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:flask_unchained_project:flask_unchained:*:*:*:*:*:*:*:*", "matchCriteriaId": "4491B634-FD96-4E0C-9584-EB97EBC710F1", "versionEndExcluding": "0.9.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\\\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False."}, {"lang": "es", "value": "Esto afecta al paquete Flask-Unchained versiones anteriores a 0.9.0. Cuando se usa la funci\u00f3n _validate_redirect_url, es posible omitir la comprobaci\u00f3n de la URL y redireccionar a un usuario a una URL arbitraria proporcionando m\u00faltiples barras invertidas, como por ejemplo \\\\\\evil.com/path. Esta vulnerabilidad s\u00f3lo es explotable si un servidor WSGI alternativo a Werkzeug es usado, o se modifica el comportamiento por defecto de Werkzeug usando \"autocorrect_location_header=False"}], "id": "CVE-2021-23393", "lastModified": "2026-06-17T03:38:40.823", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "report@snyk.io", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-06-11T00:15:09.273", "references": [{"source": "report@snyk.io", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40"}, {"source": "report@snyk.io", "tags": ["Patch", "Third Party Advisory"], "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189"}], "sourceIdentifier": "report@snyk.io", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-601"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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