CVE-2026-19505 (GCVE-0-2026-19505)

Vulnerability from cvelistv5 – Published: 2026-08-19 19:27 – Updated: 2026-08-19 19:27
VLAI
Title
RDK-B WebUI improper cryptographic signature verification vulnerability
Summary
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
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
RDK RDK-B WebUI Affected: rdkb-2025q4-kirkstone
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "RDK-B WebUI",
          "vendor": "RDK",
          "versions": [
            {
              "status": "affected",
              "version": "rdkb-2025q4-kirkstone"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-347 Improper Verification of Cryptographic Signature",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T19:27:40.654Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "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/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "RDK-B WebUI improper cryptographic signature verification vulnerability",
      "x_generator": {
        "engine": "VINCE 3.0.44",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-19505"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2026-19505",
    "datePublished": "2026-08-19T19:27:40.654Z",
    "dateReserved": "2026-08-10T19:13:26.432Z",
    "dateUpdated": "2026-08-19T19:27:40.654Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-19505",
      "date": "2026-08-24",
      "epss": "0.002",
      "percentile": "0.09777"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-19505\",\"sourceIdentifier\":\"cret@cert.org\",\"published\":\"2026-08-19T20:17:14.150\",\"lastModified\":\"2026-08-19T20:17:14.150\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\":[{\"source\":\"cret@cert.org\",\"affectedData\":[{\"vendor\":\"RDK\",\"product\":\"RDK-B WebUI\",\"versions\":[{\"version\":\"rdkb-2025q4-kirkstone\",\"status\":\"affected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui/\",\"source\":\"cret@cert.org\"},{\"url\":\"https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/\",\"source\":\"cret@cert.org\"}]}}"
  }
}



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