{"answers":{"affected":"3 open source packages ship an affected version, including flask-user and Flask-User. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-23401 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-23401 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-23401 is a medium-severity vulnerability in Flask-User, published on 5 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-23401 and fix it if it is affected.\n\nWhat it is: CVE-2021-23401 is a medium-severity vulnerability in Flask-User, published on 5 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-23401 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- flask-user (PyPI): affected all versions; no fix listed\n- flask-user (PyPI): affected all versions up to 1.0.2.2; no fix listed\n- Flask-User (PyPI): affected all versions up to 1.0.2.2; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-23401/ (Markdown: https://insights.sbomify.com/CVE-2021-23401/index.md)","id":"CVE-2021-23401","markdown":"https://insights.sbomify.com/CVE-2021-23401/index.md","name":"CVE-2021-23401","record":{"aliases":["GHSA-4298-89hc-6rfv","PYSEC-2021-337","SNYK-PYTHON-FLASKUSER-1293188"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Flask-User library","requires_auth":"none","summary":"Attackers can redirect users to arbitrary URLs via malformed slashes in Flask-User, requiring non-default WSGI server configurations.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"flask-user","vendor":"flask-user_project"}],"cvss":{"score":5.4,"severity":"medium","source":"cna","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","version":"3.1"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"This affects all versions of package Flask-User. When using the make_safe_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 or \\\\\\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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Open Redirect","id":"CVE-2021-23401","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"open_redirect","year":"2021"},"n_packages":3,"n_references":3,"next":{"headline":"Prototype Pollution","id":"CVE-2021-23402"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.0.2.2"],"package":"Flask-User","purl":null,"source":"GHSA-4298-89hc-6rfv"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":[],"package":"flask-user","purl":"pkg:pypi/flask-user","source":"PYSEC-2021-337"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.0.2.2"],"package":"flask-user","purl":"pkg:pypi/flask-user","source":"GHSA-4298-89hc-6rfv"}],"prev":{"headline":"HTTP Header Injection","id":"CVE-2021-23400"},"products":["Flask-User"],"published":"2021-07-05","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["n/a"]},"summary":"Attackers can redirect users to arbitrary URLs via malformed slashes in Flask-User, requiring non-default WSGI server configurations.","url":"https://insights.sbomify.com/CVE-2021-23401/"}