{"id":"CVE-2026-39852","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-39852","summary":"Quarkus has Authentication/Authorization bypasses","details":"Quarkus version 3.32.4 is vulnerable to an authorization bypass issue (GHSL-2026-099), in which semicolons (matrix parameters) in HTTP requests can be used to bypass security constraints, potentially allowing unauthorized access to protected resources.\n\nUnauthenticated or lower-privileged users can bypass HTTP path-based authorization policies by appending a semicolon (`;`) and arbitrary text to the request URL. The vulnerability arises from a path-normalization inconsistency: Quarkus's [security layer](https://quarkus.io/guides/security-authorize-web-endpoints-reference) performs authorization checks on the raw URL path (which preserves matrix parameters), whereas RESTEasy Reactive's routing layer strips matrix parameters before matching endpoints. This allows requests like `/api/admin;anything` to bypass policies protecting `/api/admin` while still routing to the protected endpoint.\n\n\n### Impact\n\nThis issue may lead to Authentication/Authorization bypasses.\n\n### Credits\n\nThis issue was discovered with the [GitHub Security Lab Taskflow Agent](https://github.com/GitHubSecurityLab/seclab-taskflow-agent) and manually verified by GHSL team members [@p- (Peter Stöckli)](https://github.com/p-) and [@m-y-mo (Man Yue Mo)](https://github.com/m-y-mo).","published":"2026-05-04T17:20:20Z","modified":"2026-09-10T03:50:47.474405444Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"},"epss":{"score":0.00444,"percentile":0.36812,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.quarkus:quarkus-vertx-http","fixedVersion":"3.20.6.1"},{"ecosystem":"Maven","name":"io.quarkus:quarkus-vertx-http","fixedVersion":"3.27.3.1"},{"ecosystem":"Maven","name":"io.quarkus:quarkus-vertx-http","fixedVersion":"3.33.1.1"},{"ecosystem":"Maven","name":"io.quarkus:quarkus-vertx-http","fixedVersion":"3.35.1.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/quarkusio/quarkus/security/advisories/GHSA-rc95-pcm8-65v9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39852"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:11720"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:11721"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:13631"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:17789"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:25089"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34608"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:54435"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-39852"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2457819"},{"type":"PACKAGE","url":"https://github.com/quarkusio/quarkus"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39852.json"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:50:47.474405444Z"}}