{"answers":{"affected":"8 open source packages ship an affected version, including org.springframework:spring-webflux. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-41839 in the wild and no public exploit code.","fix":"Upgrade org.springframework:spring-webflux to a fixed version for your release line: 6.2.19 or 7.0.8.","what":"CVE-2026-41839 is a medium-severity authentication bypass vulnerability in Vmware Spring Framework, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-41839 and fix it if it is affected.\n\nWhat it is: CVE-2026-41839 is a medium-severity authentication bypass vulnerability in Vmware Spring Framework, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-41839 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.springframework:spring-webflux (Maven): affected all versions up to 5.3.39; no fix listed\n- org.springframework:spring-webflux (Maven): affected all versions up to 5.3.39; no fix listed\n- org.springframework:spring-webflux (Maven): affected from 6.1.0 up to 6.1.21; no fix listed\n- org.springframework:spring-webflux (Maven): affected from 6.1.0 up to 6.1.21; no fix listed\n- org.springframework:spring-webflux (Maven): affected from 6.2.0; fixed in 6.2.19\n- org.springframework:spring-webflux (Maven): affected from 6.2.0; fixed in 6.2.19\n- org.springframework:spring-webflux (Maven): affected from 7.0.0; fixed in 7.0.8\n- org.springframework:spring-webflux (Maven): affected from 7.0.0; fixed in 7.0.8\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-2026-41839/ (Markdown: https://insights.sbomify.com/CVE-2026-41839/index.md)","id":"CVE-2026-41839","markdown":"https://insights.sbomify.com/CVE-2026-41839/index.md","name":"CVE-2026-41839","record":{"aliases":["CLEANSTART-2026-FH40291","CLSA-2026-1787647544","DEBIAN-CVE-2026-41839","ECHO-9983-5798-a1fb","GHSA-4hfh-6x8g-gwpp","MINI-57jf-2fcg-3prr","MINI-w36g-rc5q-wvxr","UBUNTU-CVE-2026-41839"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Java web framework","requires_auth":"none","summary":"Attackers can hijack user sessions in Spring WebFlux applications by exploiting session fixation vulnerabilities, leading to account takeover.","user_interaction":"required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"vmware","cpe":[{"product":"spring_framework","vendor":"vmware"}],"cvss":{"score":4.2,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-384","name":"Session Fixation"}],"description":"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.","ecosystems":["Maven"],"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":"Spring Framework Escalation via Session Fixation in WebFlux","id":"CVE-2026-41839","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"vmware:spring_framework","products":["vmware:spring_framework"],"type":"auth_bypass","year":"2026"},"n_packages":8,"n_references":1,"next":{"headline":"Spring Framework Denial of Service via Multipart Requests in WebFlux","id":"CVE-2026-41840"},"packages":[{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["5.3.39"],"package":"org.springframework:spring-webflux","purl":null,"source":"GHSA-4hfh-6x8g-gwpp"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["5.3.39"],"package":"org.springframework:spring-webflux","purl":"pkg:maven/org.springframework/spring-webflux","source":"GHSA-4hfh-6x8g-gwpp"},{"ecosystem":"Maven","fixed":[],"introduced":["6.1.0"],"last_affected":["6.1.21"],"package":"org.springframework:spring-webflux","purl":null,"source":"GHSA-4hfh-6x8g-gwpp"},{"ecosystem":"Maven","fixed":[],"introduced":["6.1.0"],"last_affected":["6.1.21"],"package":"org.springframework:spring-webflux","purl":"pkg:maven/org.springframework/spring-webflux","source":"GHSA-4hfh-6x8g-gwpp"},{"ecosystem":"Maven","fixed":["6.2.19"],"introduced":["6.2.0"],"last_affected":[],"package":"org.springframework:spring-webflux","purl":null,"source":"GHSA-4hfh-6x8g-gwpp"},{"ecosystem":"Maven","fixed":["6.2.19"],"introduced":["6.2.0"],"last_affected":[],"package":"org.springframework:spring-webflux","purl":"pkg:maven/org.springframework/spring-webflux","source":"GHSA-4hfh-6x8g-gwpp"},{"ecosystem":"Maven","fixed":["7.0.8"],"introduced":["7.0.0"],"last_affected":[],"package":"org.springframework:spring-webflux","purl":null,"source":"GHSA-4hfh-6x8g-gwpp"},{"ecosystem":"Maven","fixed":["7.0.8"],"introduced":["7.0.0"],"last_affected":[],"package":"org.springframework:spring-webflux","purl":"pkg:maven/org.springframework/spring-webflux","source":"GHSA-4hfh-6x8g-gwpp"}],"prev":{"headline":"Spring Framework Predictable Session ID in WebSocket Module","id":"CVE-2026-41838"},"products":["Spring Framework"],"published":"2026-06-09","related":[{"cvss_score":9.8,"headline":"Spring Framework Improper Path Limitation in XsltView","id":"CVE-2026-47884","kev_date_added":null,"published":"2026-08-27"},{"cvss_score":9.8,"headline":"Spring Framework Server Sent Event stream corruption while rendering fragments","id":"CVE-2026-47890","kev_date_added":null,"published":"2026-08-27"},{"cvss_score":9.8,"headline":"Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder","id":"CVE-2026-47891","kev_date_added":null,"published":"2026-08-27"},{"cvss_score":9.8,"headline":"Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints","id":"CVE-2026-47892","kev_date_added":null,"published":"2026-08-27"},{"cvss_score":9.8,"headline":"Server Sent Event stream corruption in Spring MVC functional web framework","id":"CVE-2026-59313","kev_date_added":null,"published":"2026-08-27"},{"cvss_score":9.8,"headline":"Pivotal Spring Framework contains unsafe Java deserialization methods","id":"CVE-2016-1000027","kev_date_added":null,"published":"2020-01-02"},{"cvss_score":9.1,"headline":"Spring Framework Safety Guard Bypass via SpEL Expression Compilation","id":"CVE-2026-59283","kev_date_added":null,"published":"2026-08-27"}],"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":"US public information, NVD API terms","name":"NVD"},{"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":"2026-06-23","vendors":["Spring"]},"summary":"Attackers can hijack user sessions in Spring WebFlux applications by exploiting session fixation vulnerabilities, leading to account takeover.","url":"https://insights.sbomify.com/CVE-2026-41839/"}