{"answers":{"affected":"4 open source packages ship an affected version, including github.com/authelia/authelia/v4 and github.com/authelia/authelia.","exploited":"There is no known exploitation of CVE-2026-47203 in the wild and no public exploit code.","fix":"Upgrade github.com/authelia/authelia/v4 to 4.39.20 or later.","what":"CVE-2026-47203 is a low-severity vulnerability in authelia, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-47203 and fix it if it is affected.\n\nWhat it is: CVE-2026-47203 is a low-severity vulnerability in authelia, published on 19 Jun 2026. 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-2026-47203 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/authelia/authelia/v4 (Go): affected from 4.38.0; fixed in 4.39.20\n- github.com/authelia/authelia/v4 (Go): affected from 4.38.0; fixed in 4.39.20\n- github.com/authelia/authelia/v4 (Go): affected from 4.38.0; fixed in 4.39.20\n- github.com/authelia/authelia (Go): affected all versions; 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-2026-47203/ (Markdown: https://insights.sbomify.com/CVE-2026-47203/index.md)","id":"CVE-2026-47203","markdown":"https://insights.sbomify.com/CVE-2026-47203/index.md","name":"CVE-2026-47203","record":{"aliases":["GHSA-hjj4-hfjm-fmrj","GO-2026-5430"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Authelia authentication server","requires_auth":"none","summary":"Attackers can bypass account lockout mechanisms by varying username casing in Basic Auth requests, allowing unlimited brute-force attempts against LDAP users.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":2.9,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-307","name":"Improper Restriction of Excessive Authentication Attempts"},{"id":"CWE-178","name":"Improper Handling of Case Sensitivity"}],"description":"Authelia is an open-source authentication and authorization server providing two-factor authentication and single sign-on (SSO) for applications via a web portal. In versions 4.38.0 through 4.39.19, when a user authenticates via Basic Auth (i.e via the `Authorization` header with the `Basic` scheme) on the authz verification endpoint, Authelia takes the username directly from the `Authorization` header and passes it as is to the regulation system for ban checking and attempt recording. LDAP treats usernames case insensitively : `john`, `John`, and `JOHN` all bind as the same user. But the regulation SQL queries treat the lookup of these values in certain scenarios as case sensitive. This allows each variation of a usernames case to have its own ban bucket. Upgrade to 4.39.20 to receive a patch. As a workaround, explicitly disable the basic auth mechanism.","ecosystems":["Go"],"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":"Authelia Missing Username Canonicalization in Basic Auth (LDAP)","id":"CVE-2026-47203","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes","id":"CVE-2026-47204"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/authelia/authelia","purl":"pkg:golang/github.com/authelia/authelia","source":"GO-2026-5430"},{"ecosystem":"Go","fixed":["4.39.20"],"introduced":["4.38.0"],"last_affected":[],"package":"github.com/authelia/authelia/v4","purl":null,"source":"GHSA-hjj4-hfjm-fmrj"},{"ecosystem":"Go","fixed":["4.39.20"],"introduced":["4.38.0"],"last_affected":[],"package":"github.com/authelia/authelia/v4","purl":"pkg:golang/github.com/authelia/authelia/v4","source":"GHSA-hjj4-hfjm-fmrj"},{"ecosystem":"Go","fixed":["4.39.20"],"introduced":["4.38.0"],"last_affected":[],"package":"github.com/authelia/authelia/v4","purl":"pkg:golang/github.com/authelia/authelia/v4","source":"GO-2026-5430"}],"prev":{"headline":"Kavita: Pre-Auth Account Takeover","id":"CVE-2026-47202"},"products":["authelia"],"published":"2026-06-19","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":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-22","vendors":["authelia"]},"summary":"Attackers can bypass account lockout mechanisms by varying username casing in Basic Auth requests, allowing unlimited brute-force attempts against LDAP users.","url":"https://insights.sbomify.com/CVE-2026-47203/"}