{"id":"CVE-2026-41839","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-41839","summary":"Spring Framework Escalation via Session Fixation in WebFlux","details":"A WebFlux application with a compromised subdomain (for example, compromised via cross-site scripting (XSS)) is vulnerable to an escalation attack exchanging a known session ID for that of an authenticated user.\n\nAffected versions:\nSpring Framework 7.0.0 through 7.0.7; 6.2.0 through 6.2.18; 6.1.0 through 6.1.27; 5.3.0 through 5.3.48.","published":"2026-06-09T06:31:57Z","modified":"2026-09-10T03:50:48.208174605Z","cvss":{"score":4.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"},"epss":{"score":0.00213,"percentile":0.11492,"asOf":"2026-09-02"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.springframework:spring-webflux","fixedVersion":"7.0.8"},{"ecosystem":"Maven","name":"org.springframework:spring-webflux","fixedVersion":"6.2.19"},{"ecosystem":"Maven","name":"org.springframework:spring-webflux","fixedVersion":null},{"ecosystem":"Maven","name":"org.springframework:spring-webflux","fixedVersion":null}],"fix":{"url":"https://github.com/spring-projects/spring-framework/commit/b8ddd2c690fe3f00bb5e3d9f913a37504aab49a0","label":"spring-projects/spring-framework@b8ddd2c"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41839"},{"type":"WEB","url":"https://github.com/spring-projects/spring-framework/issues/36742"},{"type":"WEB","url":"https://github.com/spring-projects/spring-framework/issues/36743"},{"type":"WEB","url":"https://github.com/spring-projects/spring-framework/commit/b8ddd2c690fe3f00bb5e3d9f913a37504aab49a0"},{"type":"WEB","url":"https://github.com/spring-projects/spring-framework/commit/d72da90d3a562632e2b565113813f7b4a31f8717"},{"type":"PACKAGE","url":"https://github.com/spring-projects/spring-framework"},{"type":"WEB","url":"https://github.com/spring-projects/spring-framework/releases/tag/v6.2.19"},{"type":"WEB","url":"https://github.com/spring-projects/spring-framework/releases/tag/v7.0.8"},{"type":"WEB","url":"https://spring.io/security/cve-2026-41839"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:50:48.208174605Z"}}