CVE-2026-87743

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An unauthenticated attacker can exploit a discrepancy in how paths are normalized between the security matcher and HTTP request dispatchers. This allows the attacker to craft a URL that the security matcher considers public, but which is then routed to a protected endpoint, leading to an authorization bypass and potential unauthorized access to sensitive information."}], "id": "CVE-2026-87743", "lastModified": "2026-10-29T18:17:36.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-87743", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-22T14:15:59.292451Z", "version": "2.0.3"}}]}, "published": "2026-09-18T10:17:07.520", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:69440"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:69470"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:90321"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-87743"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2530523"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-551"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Michael Read (https://github.com/Michael-JRead) for reporting this issue.", "bugzilla": {"description": "quarkus-vertx-http: Authorization Bypass via Path Normalization Discrepancy in Quarkus HTTP Security", "id": "2530523", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2530523"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-551", "details": ["A flaw was found in Quarkus HTTP security. An unauthenticated attacker can exploit a discrepancy in how paths are normalized between the security matcher and HTTP request dispatchers. This allows the attacker to craft a URL that the security matcher considers public, but which is then routed to a protected endpoint, leading to an authorization bypass and potential unauthorized access to sensitive information."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-87743", "public_date": "2026-09-17T13:10:22Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-87743\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-87743"], "statement": "This is an Important flaw as it allows unauthenticated attackers to bypass path-based access control rules in Quarkus HTTP security. The discrepancy in path normalization between the security matcher and HTTP request dispatchers could lead to unauthorized access to protected endpoints in applications deployed with Quarkus.", "threat_severity": "Important"}

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