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.
Published: 2026-08-19
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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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:

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 : Received

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

Modified: 2026-08-27T17:17:38.910

Link: CVE-2026-19505

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T06:00:14Z

Weaknesses