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.
History

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Thu, 27 Aug 2026 17:30:00 +0000

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'}


Thu, 20 Aug 2026 23:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Thu, 20 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Thu, 20 Aug 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Rdk
Rdk rdk-b Webui
Vendors & Products Rdk
Rdk rdk-b Webui

Wed, 19 Aug 2026 23:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Wed, 19 Aug 2026 19:30:00 +0000

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

cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published: 2026-08-19T19:27:40.654Z

Updated: 2026-08-27T16:10:08.424Z

Reserved: 2026-08-10T19:13:26.432Z

Link: CVE-2026-19505

cve-icon Vulnrichment

Updated: 2026-08-27T16:09:37.728Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-19T20:17:14.150

Modified: 2026-09-03T17:42:23.907

Link: CVE-2026-19505

cve-icon Redhat

No data.