FKIE_CVE-2026-19505

Vulnerability from fkie_nvd - Published: 2026-08-19 20:17 - Updated: 2026-08-19 20:17
Severity
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.
References
cret@cert.orghttps://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui/
cret@cert.orghttps://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "RDK-B WebUI",
          "vendor": "RDK",
          "versions": [
            {
              "status": "affected",
              "version": "rdkb-2025q4-kirkstone"
            }
          ]
        }
      ],
      "source": "cret@cert.org"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2026-19505",
  "lastModified": "2026-08-19T20:17:14.150",
  "metrics": {},
  "published": "2026-08-19T20:17:14.150",
  "references": [
    {
      "source": "cret@cert.org",
      "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/"
    }
  ],
  "sourceIdentifier": "cret@cert.org",
  "vulnStatus": "Received"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.