CVE-2026-19505

RDK-B WebUI improper cryptographic signature verification vulnerability

Published Aug 19, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-287
Type Values Removed Values Added
Weaknesses CWE-347
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-287
Type Values Removed Values Added
Weaknesses CWE-287
Type Values Removed Values Added
First Time appeared Rdk
Rdk rdk-b Webui
Vendors & Products Rdk
Rdk rdk-b Webui
Type Values Removed Values Added
Weaknesses CWE-287
Type Values Removed Values Added
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.
Title RDK-B WebUI improper cryptographic signature verification vulnerability
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Aug 27, 2026, 4:10 PM
Reserved
Aug 10, 2026, 7:13 PM
Status
Awaiting Analysis
Published
Aug 19, 2026, 8:17 PM
Modified
Sep 3, 2026, 5:42 PM