{"id":"CVE-2026-19505","state":"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.","publishedAt":"2026-08-19T19:27:40.654Z","updatedAt":"2026-08-27T16:10:08.424Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"certcc","products":["RDK RDK-B WebUI"],"affected":[{"vendor":"RDK","product":"RDK-B WebUI","versions":[{"version":"rdkb-2025q4-kirkstone","status":"affected"}]}],"references":["https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/","https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui/"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/19xxx/CVE-2026-19505.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-19505","state":"PUBLISHED","datePublished":"2026-08-19T19:27:40.654Z","dateUpdated":"2026-08-27T16:10:08.424Z","assignerShortName":"certcc","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateReserved":"2026-08-10T19:13:26.432Z"},"containers":{"cna":{"title":"RDK-B WebUI improper cryptographic signature verification vulnerability","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"RDK","product":"RDK-B WebUI","versions":[{"version":"rdkb-2025q4-kirkstone","status":"affected"}]}],"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/"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-347 Improper Verification of Cryptographic Signature"}]}],"providerMetadata":{"shortName":"certcc","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateUpdated":"2026-08-19T19:27:40.654Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"VINCE 3.0.44","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-19505"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T16:10:04.555156Z","id":"CVE-2026-19505","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","type":"CWE","lang":"en","description":"CWE-347 Improper Verification of Cryptographic Signature"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-27T16:10:08.424Z"}}]}}}