{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-47203", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-18T22:07:37.436Z", "datePublished": "2026-06-19T20:19:47.903Z", "dateUpdated": "2026-06-22T18:13:48.660Z"}, "containers": {"cna": {"title": "Authelia Missing Username Canonicalization in Basic Auth (LDAP)", "problemTypes": [{"descriptions": [{"cweId": "CWE-178", "lang": "en", "description": "CWE-178: Improper Handling of Case Sensitivity", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-307", "lang": "en", "description": "CWE-307: Improper Restriction of Excessive Authentication Attempts", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 2.9, "baseSeverity": "LOW", "vectorString": "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"}}], "references": [{"name": "https://github.com/authelia/authelia/security/advisories/GHSA-hjj4-hfjm-fmrj", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/authelia/authelia/security/advisories/GHSA-hjj4-hfjm-fmrj"}, {"name": "https://github.com/authelia/authelia/commit/b8985b57b70acdff8f204ed426ff619e763461ad", "tags": ["x_refsource_MISC"], "url": "https://github.com/authelia/authelia/commit/b8985b57b70acdff8f204ed426ff619e763461ad"}], "affected": [{"vendor": "authelia", "product": "authelia", "versions": [{"version": ">= 4.38.0, < 4.39.20", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-19T20:19:47.903Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-hjj4-hfjm-fmrj", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-22T17:29:23.539472Z", "id": "CVE-2026-47203", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-22T18:13:48.660Z"}}]}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.38.0,4.39.20)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "authelia", "source": "cna", "vendor": "authelia"}, "product": "authelia", "vendor": "authelia"}], "created": "2026-06-19T21:15:16.825823+00:00", "updated": "2026-06-19T22:00:06.979933+00:00", "vendors": ["authelia", "authelia$PRODUCT$authelia"]}