{"api_version":"1","generated_at":"2026-07-23T14:28:20+00:00","cve":"CVE-2021-21241","urls":{"html":"https://cve.report/CVE-2021-21241","api":"https://cve.report/api/cve/CVE-2021-21241.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-21241","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21241"},"summary":{"title":"CVE-2021-21241","description":"The Python \"Flask-Security-Too\" package is used for adding security features to your Flask application. It is an is a independently maintained version of Flask-Security based on the 3.0.0 version of Flask-Security. In Flask-Security-Too from version 3.3.0 and before version 3.4.5, the /login and /change endpoints can return the authenticated user's authentication token in response to a GET request. Since GET requests aren't protected with a CSRF token, this could lead to a malicious 3rd party site acquiring the authentication token. Version 3.4.5 and version 4.0.0 are patched. As a workaround, if you aren't using authentication tokens - you can set the SECURITY_TOKEN_MAX_AGE to \"0\" (seconds) which should make the token unusable.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2021-01-11 21:15:00","updated_at":"2021-01-19 15:43:00"},"problem_types":["CWE-352"],"metrics":[],"references":[{"url":"https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a","name":"https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Fix security vuln - GET on /login or /change could reveal authenticat… · Flask-Middleware/flask-security@6d50ee9 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://pypi.org/project/Flask-Security-Too","name":"https://pypi.org/project/Flask-Security-Too","refsource":"MISC","tags":["Product","Third Party Advisory"],"title":"Flask-Security-Too · PyPI","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5","name":"https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5","refsource":"MISC","tags":["Third Party Advisory"],"title":"Release Fix CSRF Vulnerability · Flask-Middleware/flask-security · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv","name":"https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv","refsource":"CONFIRM","tags":["Third Party Advisory"],"title":"CSRF Vuln can expose users authentication token · Advisory · Flask-Middleware/flask-security · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://github.com/Flask-Middleware/flask-security/pull/422","name":"https://github.com/Flask-Middleware/flask-security/pull/422","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Fix security vuln - GET on /login or /change could reveal authenticat… by jwag956 · Pull Request #422 · Flask-Middleware/flask-security · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f","name":"https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"I421backport (#425) · Flask-Middleware/flask-security@61d3131 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-21241","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21241","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"21241","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"flask-security-too_project","cpe5":"flask-security-too","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"21241","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"flask-security-too_project","cpe5":"flask-security-too","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-21241","qid":"179957","title":"Debian Security Update for flask-security (CVE-2021-21241)"},{"cve":"CVE-2021-21241","qid":"752549","title":"SUSE Enterprise Linux Security Update for python-Flask-Security-Too (SUSE-SU-2022:3093-1)"},{"cve":"CVE-2021-21241","qid":"983060","title":"Python (pip) Security Update for Flask-Security-Too (GHSA-hh7m-rx4f-4vpv)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-21241","STATE":"PUBLIC","TITLE":"CSRF can expose users authentication token in Flask-Security-Too"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"flask-security-too","version":{"version_data":[{"version_value":">= 3.3.0, < 3.4.5"}]}}]},"vendor_name":"Flask-Middleware"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"The Python \"Flask-Security-Too\" package is used for adding security features to your Flask application. It is an is a independently maintained version of Flask-Security based on the 3.0.0 version of Flask-Security. In Flask-Security-Too from version 3.3.0 and before version 3.4.5, the /login and /change endpoints can return the authenticated user's authentication token in response to a GET request. Since GET requests aren't protected with a CSRF token, this could lead to a malicious 3rd party site acquiring the authentication token. Version 3.4.5 and version 4.0.0 are patched. As a workaround, if you aren't using authentication tokens - you can set the SECURITY_TOKEN_MAX_AGE to \"0\" (seconds) which should make the token unusable."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-352: Cross-Site Request Forgery (CSRF)"}]}]},"references":{"reference_data":[{"name":"https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv","refsource":"CONFIRM","url":"https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-hh7m-rx4f-4vpv"},{"name":"https://github.com/Flask-Middleware/flask-security/pull/422","refsource":"MISC","url":"https://github.com/Flask-Middleware/flask-security/pull/422"},{"name":"https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f","refsource":"MISC","url":"https://github.com/Flask-Middleware/flask-security/commit/61d313150b5f620d0b800896c4f2199005e84b1f"},{"name":"https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a","refsource":"MISC","url":"https://github.com/Flask-Middleware/flask-security/commit/6d50ee9169acf813257c37b75babe9c28e83542a"},{"name":"https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5","refsource":"MISC","url":"https://github.com/Flask-Middleware/flask-security/releases/tag/3.4.5"},{"name":"https://pypi.org/project/Flask-Security-Too","refsource":"MISC","url":"https://pypi.org/project/Flask-Security-Too"}]},"source":{"advisory":"GHSA-hh7m-rx4f-4vpv","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2021-01-11 21:15:00","lastModifiedDate":"2021-01-19 15:43:00","problem_types":["CWE-352"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH"},"exploitabilityScore":2.8,"impactScore":4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:N/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:flask-security-too_project:flask-security-too:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3.0","versionEndExcluding":"3.4.5","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"21241","Ordinal":"195367","Title":"CVE-2021-21241","CVE":"CVE-2021-21241","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"21241","Ordinal":"1","NoteData":"The Python \"Flask-Security-Too\" package is used for adding security features to your Flask application. It is an is a independently maintained version of Flask-Security based on the 3.0.0 version of Flask-Security. In Flask-Security-Too from version 3.3.0 and before version 3.4.5, the /login and /change endpoints can return the authenticated user's authentication token in response to a GET request. Since GET requests aren't protected with a CSRF token, this could lead to a malicious 3rd party site acquiring the authentication token. Version 3.4.5 and version 4.0.0 are patched. As a workaround, if you aren't using authentication tokens - you can set the SECURITY_TOKEN_MAX_AGE to \"0\" (seconds) which should make the token unusable.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"21241","Ordinal":"2","NoteData":"2021-01-11","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"21241","Ordinal":"3","NoteData":"2021-01-11","Type":"Other","Title":"Modified"}]}}}