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.
References
- https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_docum
- https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/
FAQ
What is CVE-2026-19505?
CVE-2026-19505 is a documented vulnerability. 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 vi...
How severe is CVE-2026-19505?
CVSS scoring is not yet available for CVE-2026-19505. Check NVD for updates.
Is there a patch for CVE-2026-19505?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.