{"answers":{"affected":"12 open source packages ship an affected version, including symfony/security, symfony/security-core and symfony/symfony. It affects 1 product.","exploited":"There is no known exploitation of CVE-2016-2403 in the wild and no public exploit code.","fix":"Upgrade symfony/security to a fixed version for your release line: 2.8.6 or 3.0.6.","what":"CVE-2016-2403 is a critical authentication bypass vulnerability in Sensiolabs Symfony, published on 7 Feb 2017. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2016-2403 and fix it if it is affected.\n\nWhat it is: CVE-2016-2403 is a critical authentication bypass vulnerability in Sensiolabs Symfony, published on 7 Feb 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2016-2403 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- symfony/security (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/security (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/security (Packagist): affected from 3.0.0; fixed in 3.0.6\n- symfony/security (Packagist): affected from 3.0.0; fixed in 3.0.6\n- symfony/security-core (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/security-core (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/security-core (Packagist): affected from 3.0.0; fixed in 3.0.6\n- symfony/security-core (Packagist): affected from 3.0.0; fixed in 3.0.6\n- symfony/symfony (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/symfony (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/symfony (Packagist): affected from 3.0.0; fixed in 3.0.6\n- symfony/symfony (Packagist): affected from 3.0.0; fixed in 3.0.6\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-2016-2403/ (Markdown: https://insights.sbomify.com/CVE-2016-2403/index.md)","id":"CVE-2016-2403","markdown":"https://insights.sbomify.com/CVE-2016-2403/index.md","name":"CVE-2016-2403","record":{"aliases":["DEBIAN-CVE-2016-2403","GHSA-wvj5-r78r-hhfq"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Symfony PHP framework","requires_auth":"none","summary":"Remote attackers can bypass authentication by logging in with a valid username and empty password, triggering an unauthenticated bind.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"symfony","vendor":"sensiolabs"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.","ecosystems":["Packagist"],"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":"Symfony Authentication Bypass","id":"CVE-2016-2403","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"sensiolabs:symfony","products":["sensiolabs:symfony"],"type":"auth_bypass","year":"2016"},"n_packages":12,"n_references":3,"next":{"headline":"Privilege escalation in S5700, S6700, S7700, S9700,S12700,ACU2,, S5700, S6700, S7700, S9700 V200R001C00SPC300, V200R002C00SPC100, V200R003C00SPC300, V200R005C00SPC500, V200R006C00,,S12700 V200R005C00SPC500, V200R006C00,,ACU2 V200R005C00SPC500, V200R006C00,","id":"CVE-2016-2404"},"packages":[{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security","purl":null,"source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security","purl":"pkg:composer/symfony/security","source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security","purl":null,"source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security","purl":"pkg:composer/symfony/security","source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security-core","purl":null,"source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security-core","purl":"pkg:composer/symfony/security-core","source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security-core","purl":null,"source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security-core","purl":"pkg:composer/symfony/security-core","source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-wvj5-r78r-hhfq"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-wvj5-r78r-hhfq"}],"prev":{"headline":"Improper Certificate Validation in OkHttp","id":"CVE-2016-2402"},"products":["n/a"],"published":"2017-02-07","related":[{"cvss_score":9.8,"headline":"Improper Input Validation in Symfony","id":"CVE-2019-11325","kev_date_added":null,"published":"2019-11-21"},{"cvss_score":9.8,"headline":"Symfony Incorrect Access Control","id":"CVE-2017-11365","kev_date_added":null,"published":"2019-05-23"},{"cvss_score":9.8,"headline":"Invalid HTTP method overrides allow possible XSS or other attacks in Symfony","id":"CVE-2019-10913","kev_date_added":null,"published":"2019-05-16"},{"cvss_score":9.8,"headline":"Symfony Authentication Bypass","id":"CVE-2018-11407","kev_date_added":null,"published":"2018-06-13"},{"cvss_score":9.1,"headline":"Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator","id":"CVE-2026-45063","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":8.8,"headline":"Symfony: OidcTokenHandler Accepts JWTs Missing aud/iss/exp Claims","id":"CVE-2026-45069","kev_date_added":null,"published":"2026-07-14"}],"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":"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":"2024-08-05","vendors":["n/a"]},"summary":"Remote attackers can bypass authentication by logging in with a valid username and empty password, triggering an unauthenticated bind.","url":"https://insights.sbomify.com/CVE-2016-2403/"}