{"cve":"CVE-2026-2742","nvd":{"published":"2026-03-10T18:18:49.410","modified":"2026-06-17T10:31:38.390","status":"Analyzed","description":"An authentication bypass vulnerability exists in Vaadin 14.0.0 through 14.14.0, 23.0.0 through 23.6.6, 24.0.0 through 24.9.7 and 25.0.0 through 25.0.1, applications using Spring Security due to inconsistent path pattern matching of reserved framework paths.\n\nAccessing the /VAADIN endpoint without a trailing slash bypasses security filters, and allowing unauthenticated users to trigger framework initialization and create sessions without proper authorization.\n\nUsers of affected versions using Spring Security should upgrade as follows: 14.0.0-14.14.0 upgrade to 14.14.1, 23.0.0-23.6.6 to 23.6.7, 24.0.0 - 24.9.7 to 24.9.8, and 25.0.0-25.0.1 upgrade to 25.0.2 or newer.\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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/S:N/AU:Y/R:A/V:D/RE:L/U:Amber","score":5.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-284"],"references":["https://github.com/vaadin/flow/pull/22998","https://github.com/vaadin/flow/pull/23033","https://github.com/vaadin/flow/pull/23034","https://github.com/vaadin/flow/pull/23037","https://github.com/vaadin/flow/pull/23052"],"products":["vaadin:vaadin"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-2742","score":0.00407,"percentile":0.34972,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rjgh-wgc7-m37j","url":"https://osv.dev/vulnerability/GHSA-rjgh-wgc7-m37j","summary":"Vaadin Vulnerable to Authentication Bypass When Accessing the /VAADIN Endpoint Without a Trailing Slash","modified":"2026-09-10T03:50:41.180797417Z","packages":[{"ecosystem":"Maven","name":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","ranges":["<14.14.1"],"fixed":["14.14.1"]},{"ecosystem":"Maven","name":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","ranges":[">=23.0.0 <23.6.7"],"fixed":["23.6.7"]},{"ecosystem":"Maven","name":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","ranges":[">=24.0.0 <24.9.8"],"fixed":["24.9.8"]},{"ecosystem":"Maven","name":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","ranges":[">=25.0.0 <25.0.2"],"fixed":["25.0.2"]},{"ecosystem":"Maven","name":"com.vaadin:vaadin","purl":"pkg:maven/com.vaadin/vaadin","ranges":[">=25.0.0 <25.0.2"],"fixed":["25.0.2"]},{"ecosystem":"Maven","name":"com.vaadin:vaadin","purl":"pkg:maven/com.vaadin/vaadin","ranges":[">=24.0.0 <24.9.8"],"fixed":["24.9.8"]},{"ecosystem":"Maven","name":"com.vaadin:vaadin","purl":"pkg:maven/com.vaadin/vaadin","ranges":[">=23.0.0 <23.6.7"],"fixed":["23.6.7"]},{"ecosystem":"Maven","name":"com.vaadin:vaadin","purl":"pkg:maven/com.vaadin/vaadin","ranges":["<14.14.1"],"fixed":["14.14.1"]}]}],"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."]}