{"id":"CVE-2021-23393","state":"PUBLISHED","title":"Open Redirect","description":"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.","publishedAt":"2021-06-10T23:20:10.252Z","updatedAt":"2024-09-16T17:18:13.774Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"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","source":"snyk"},"assigner":"snyk","products":["n/a Flask-Unchained"],"affected":[{"vendor":"n/a","product":"Flask-Unchained","versions":[{"version":"unspecified","status":"affected","lessThan":"0.9.0","versionType":"custom"}]}],"references":["https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189","https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40"],"weaknesses":[],"ingestedAt":"2026-10-29T19:48:04.982Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/23xxx/CVE-2021-23393.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-23393","state":"PUBLISHED","datePublished":"2021-06-10T23:20:10.252Z","dateUpdated":"2024-09-16T17:18:13.774Z","assignerShortName":"snyk","assignerOrgId":"bae035ff-b466-4ff4-94d0-fc9efd9e1730","dateReserved":"2021-01-08T00:00:00.000Z"},"containers":{"cna":{"title":"Open Redirect","descriptions":[{"lang":"en","value":"This affects the package Flask-Unchained before 0.9.0. 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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."}],"affected":[{"vendor":"n/a","product":"Flask-Unchained","versions":[{"version":"unspecified","status":"affected","lessThan":"0.9.0","versionType":"custom"}]}],"references":[{"url":"https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189","tags":["x_refsource_MISC"]},{"url":"https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40","tags":["x_refsource_MISC"]}],"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":{"shortName":"snyk","dateUpdated":"2021-06-10T23:20:10.000Z","orgId":"bae035ff-b466-4ff4-94d0-fc9efd9e1730"},"credits":[{"lang":"en","value":"Noam Moshe of Claroty"}],"datePublic":"2021-06-10T00:00:00.000Z","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. 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