{"id":"CVE-2026-19505","aliases":["EUVD-2026-62711","GHSA-j328-w5qv-gh82"],"status":"published","title":"RDK-B WebUI improper cryptographic signature verification vulnerability","description":"Improper cryptographic signature verification in `jst_functions.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-12","score":0.00511,"percentile":0.44124,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-347"],"published":"2026-08-19T19:27:40Z","modified":"2026-09-03T17:42:23Z","products":[{"vendor":"rdk","product":"rdk-b webui"}],"references":[{"url":"https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/"},{"url":"https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui/"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19505"},{"url":"https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui"},{"url":"https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb"},{"url":"https://github.com/advisories/GHSA-j328-w5qv-gh82"}],"sources":{"cve":[{"id":"CVE-2026-19505","title":"RDK-B WebUI improper cryptographic signature verification vulnerability","description":"Improper cryptographic signature verification in `jst_functions.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.","status":"published","published":"2026-08-19T19:27:40.654Z","modified":"2026-08-27T16:10:08.424Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T13:47:17.512524Z"}],"euvd":[{"id":"EUVD-2026-62711","description":"Improper cryptographic signature verification in `jst_functions.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.","status":"published","published":"2026-08-19T19:27:40Z","modified":"2026-08-27T16:10:08Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T18:01:27.663452Z"}],"ghsa":[{"id":"GHSA-j328-w5qv-gh82","title":"Improper cryptographic signature verification in `jst_functions.c` in RDK-B WebUI `rdkb-2025q4...","description":"Improper cryptographic signature verification in `jst_functions.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.","status":"published","published":"2026-08-19T21:30:36Z","modified":"2026-08-27T18:31:55Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:11:03.315113Z"}],"nvd":[{"id":"CVE-2026-19505","description":"Improper cryptographic signature verification in `jst_functions.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.","status":"published","published":"2026-08-19T20:17:14.15Z","modified":"2026-09-03T17:42:23.907Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:12:39.962615Z"}]}}