CVE-2026-19505

RDK-B WebUI improper cryptographic signature verification vulnerability

State: Published
Severity: 9.8 Critical
Published: Aug 19, 2026
Updated: Aug 27, 2026
Reserved: Aug 10, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
RDK-B WebUIRDK	rdkb-2025q4-kirkstoneAffected

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/

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