{"answers":{"affected":"3 open source packages ship an affected version, including flask-unchained and Flask-Unchained. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-23393 in the wild and no public exploit code.","fix":"Upgrade flask-unchained to 0.9.0 or later.","what":"CVE-2021-23393 is a medium-severity vulnerability in Flask-Unchained, published on 10 Jun 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-2021-23393 and fix it if it is affected.\n\nWhat it is: CVE-2021-23393 is a medium-severity vulnerability in Flask-Unchained, published on 10 Jun 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-2021-23393 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- flask-unchained (PyPI): affected all versions; fixed in 0.9.0\n- flask-unchained (PyPI): affected all versions; fixed in 0.9.0\n- Flask-Unchained (PyPI): affected all versions; fixed in 0.9.0\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-2021-23393/ (Markdown: https://insights.sbomify.com/CVE-2021-23393/index.md)","id":"CVE-2021-23393","markdown":"https://insights.sbomify.com/CVE-2021-23393/index.md","name":"CVE-2021-23393","record":{"aliases":["GHSA-pjc4-3w99-j7v4","PYSEC-2021-96","SNYK-PYTHON-FLASKUNCHAINED-1293189"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Flask-Unchained library","requires_auth":"none","summary":"Attackers can bypass URL validation to redirect users to arbitrary sites when using non-default WSGI configurations in Flask-Unchained.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"flask_unchained","vendor":"flask_unchained_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 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.","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":true,"headline":"Open Redirect","id":"CVE-2021-23393","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"open_redirect","year":"2021"},"n_packages":3,"n_references":2,"next":{"headline":"Remote Code Execution (RCE)","id":"CVE-2021-23394"},"packages":[{"ecosystem":"PyPI","fixed":["0.9.0"],"introduced":["0"],"last_affected":[],"package":"Flask-Unchained","purl":null,"source":"GHSA-pjc4-3w99-j7v4"},{"ecosystem":"PyPI","fixed":["0.9.0"],"introduced":["0"],"last_affected":[],"package":"flask-unchained","purl":"pkg:pypi/flask-unchained","source":"GHSA-pjc4-3w99-j7v4"},{"ecosystem":"PyPI","fixed":["0.9.0"],"introduced":["0"],"last_affected":[],"package":"flask-unchained","purl":"pkg:pypi/flask-unchained","source":"PYSEC-2021-96"}],"prev":{"headline":"Regular Expression Denial of Service (ReDoS)","id":"CVE-2021-23392"},"products":["Flask-Unchained"],"published":"2021-06-10","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 bypass URL validation to redirect users to arbitrary sites when using non-default WSGI configurations in Flask-Unchained.","url":"https://insights.sbomify.com/CVE-2021-23393/"}