{"cve":"CVE-2026-110737","nvd":{"published":"2026-10-27T11:17:27.020","modified":"2026-10-27T11:17:27.020","status":"Received","description":"The push endpoint of a Vaadin application that uses server push reflects the request Origin into the Access-Control-Allow-Origin response header and allows credentials, because Flow configures Atmosphere with DROP_ACCESS_CONTROL_ALLOW_ORIGIN_HEADER set to false and its CorsInterceptor then echoes whatever Origin the request carries. A page on any origin can therefore make a cross origin request to that endpoint with the user's cookies and read the response, although reading anything useful also requires the push identifier of that session. Applications that do not use @Push are not affected, and neither is the WebSocket transport. The behaviour was introduced in January 2015 and is present in every Flow release and in Vaadin Framework from 7.1.0, which is when push was added.\n\n\nUsers of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:\n\nProduct version\nVaadin 14.14.0 - 14.14.7\nVaadin 23.6.0 - 23.6.16\nVaadin 24.4.0 - 24.4.25\nVaadin 24.5.0 - 24.5.15\nVaadin 24.6.0 - 24.6.13\nVaadin 24.7.0 - 24.7.16\nVaadin 24.8.0 - 24.8.17\nVaadin 24.9.0 - 24.9.23\nVaadin 24.10.0 - 24.10.11\nVaadin 25.0.0 - 25.0.13\nVaadin 25.1.0 - 25.1.13\nVaadin 25.2.0 - 25.2.10\nVaadin 25.3.0 - 25.3.2\nVaadin Framework 7.1.0 - 7.7.54\nVaadin Framework 8.0.0 - 8.32.1\n\nMitigation\nUpgrade to 14.14.8\nUpgrade to 23.6.17\nUpgrade to 24.4.26\nUpgrade to 24.7.17\nUpgrade to 24.7.17\nUpgrade to 24.7.17\nUpgrade to 24.9.24\nUpgrade to 24.9.24\nUpgrade to 24.10.12\nUpgrade to 25.2.11\nUpgrade to 25.2.11\nUpgrade to 25.2.11\nUpgrade to 25.3.3\nUpgrade to 7.7.55\nUpgrade to 8.32.2\n\nPlease note that Vaadin versions 10-13 and 15-22 are no longer supported and you should update either to the latest 14, 23, 24, 25 version.\n\nArtifacts\nMaven coordinates / Vulnerable versions / Fixed version\ncom.vaadin:vaadin / 14.14.0 - 14.14.7 / >=14.14.8\ncom.vaadin:vaadin / 23.6.0 - 23.6.16 / >=23.6.17\ncom.vaadin:vaadin / 24.4.0 - 24.4.25 / >=24.4.26\ncom.vaadin:vaadin / 24.5.0 - 24.5.15 / >=24.7.17\ncom.vaadin:vaadin / 24.6.0 - 24.6.13 / >=24.7.17\ncom.vaadin:vaadin / 24.7.0 - 24.7.16 / >=24.7.17\ncom.vaadin:vaadin / 24.8.0 - 24.8.17 / >=24.9.24\ncom.vaadin:vaadin / 24.9.0 - 24.9.23 / >=24.9.24\ncom.vaadin:vaadin / 24.10.0 - 24.10.11 / >=24.10.12\ncom.vaadin:vaadin / 25.0.0 - 25.0.13 / >=25.2.11\ncom.vaadin:vaadin / 25.1.0 - 25.1.13 / >=25.2.11\ncom.vaadin:vaadin / 25.2.0 - 25.2.10 / >=25.2.11\ncom.vaadin:vaadin / 25.3.0 - 25.3.2 / >=25.3.3\ncom.vaadin:vaadin-core / 14.14.0 - 14.14.7 / >=14.14.8\ncom.vaadin:vaadin-core / 23.6.0 - 23.6.16 / >=23.6.17\ncom.vaadin:vaadin-core / 24.4.0 - 24.4.25 / >=24.4.26\ncom.vaadin:vaadin-core / 24.5.0 - 24.5.15 / >=24.7.17\ncom.vaadin:vaadin-core / 24.6.0 - 24.6.13 / >=24.7.17\ncom.vaadin:vaadin-core / 24.7.0 - 24.7.16 / >=24.7.17\ncom.vaadin:vaadin-core / 24.8.0 - 24.8.17 / >=24.9.24\ncom.vaadin:vaadin-core / 24.9.0 - 24.9.23 / >=24.9.24\ncom.vaadin:vaadin-core / 24.10.0 - 24.10.11 / >=24.10.12\ncom.vaadin:vaadin-core / 25.0.0 - 25.0.13 / >=25.2.11\ncom.vaadin:vaadin-core / 25.1.0 - 25.1.13 / >=25.2.11\ncom.vaadin:vaadin-core / 25.2.0 - 25.2.10 / >=25.2.11\ncom.vaadin:vaadin-core / 25.3.0 - 25.3.2 / >=25.3.3\ncom.vaadin:flow-server / 2.13.0 - 2.13.7 / >=2.13.8\ncom.vaadin:flow-server / 23.6.0 - 23.6.15 / >=23.6.16\ncom.vaadin:flow-server / 24.4.0 - 24.4.18 / >=24.4.19\ncom.vaadin:flow-server / 24.5.0 - 24.5.17 / >=24.7.17\ncom.vaadin:flow-server / 24.6.0 - 24.6.14 / >=24.7.17\ncom.vaadin:flow-server / 24.7.0 - 24.7.15 / >=24.7.16\ncom.vaadin:flow-server / 24.8.0 - 24.8.16 / >=24.9.24\ncom.vaadin:flow-server / 24.9.0 - 24.9.28 / >=24.9.29\ncom.vaadin:flow-server / 24.10.0 - 24.10.14 / >=24.10.15\ncom.vaadin:flow-server / 25.0.0 - 25.0.15 / >=25.2.11\ncom.vaadin:flow-server / 25.1.0 - 25.1.18 / >=25.1.19\ncom.vaadin:flow-server / 25.2.0 - 25.2.12 / >=25.2.13\ncom.vaadin:flow-server / 25.3.0 - 25.3.3 / >=25.3.4\ncom.vaadin:vaadin-server / 7.1.0 - 7.7.54 / >=7.7.55\ncom.vaadin:vaadin-server / 8.0.0 - 8.32.1 / >=8.32.2\ncom.vaadin:vaadin-server-mpr-jakarta / 7.7.36 - 7.7.54 / >=7.7.55\ncom.vaadin:vaadin-server-mpr-jakarta / 8.18.0 - 8.32.1 / >=8.32.2","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":2.3},"cvss_v3":null,"cwes":["CWE-346","CWE-942"],"references":["https://github.com/vaadin/flow/issues/26214","https://github.com/vaadin/flow/pull/26215","https://vaadin.com/security/cve-2026-110737"],"products":[],"source":"nvd","synced_at":"2026-10-27T11:44:06.037769800+00:00"},"epss":null,"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}