CVE-2026-19505

critical · 9.8

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.

9.8

CVSS

0.5%

EPSS (exploit prob.)

43rd

EPSS percentile

2026-08-19

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-347

References

https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui/
https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-19505