CVE-2026-19505: CWE-347 Improper Verification of Cryptographic Signature in RDK RDK-B WebUI
CVE-2026-19505 is a vulnerability in the RDK-B WebUI where improper verification of cryptographic signatures in the jst_functions.c file allows remote attackers to bypass authentication. By using a forged JWT with an invalid RSA signature, an attacker can gain administrative access to the system. No patch or official remediation has been confirmed at this time.
AI Analysis
Technical Summary
This vulnerability involves improper cryptographic signature verification (CWE-347) in the RDK-B WebUI component, specifically in the jst_functions.c source file. The flaw allows a remote attacker to bypass authentication mechanisms by presenting a forged JSON Web Token (JWT) containing an invalid RSA signature, thereby obtaining administrative privileges. The affected product is RDK-B WebUI version rdkb-2025q4-kirkstone.04.10.26. There is no CVSS score or vendor advisory indicating a fix or mitigation, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation results in unauthorized administrative access to the RDK-B WebUI, potentially allowing full control over the affected device or system. This compromises the integrity and security of the system by bypassing authentication controls.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the RDK-B WebUI interface to trusted networks and monitor for suspicious activity related to JWT authentication attempts.
CVE-2026-19505: CWE-347 Improper Verification of Cryptographic Signature in RDK RDK-B WebUI
Description
CVE-2026-19505 is a vulnerability in the RDK-B WebUI where improper verification of cryptographic signatures in the jst_functions.c file allows remote attackers to bypass authentication. By using a forged JWT with an invalid RSA signature, an attacker can gain administrative access to the system. No patch or official remediation has been confirmed at this time.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper cryptographic signature verification (CWE-347) in the RDK-B WebUI component, specifically in the jst_functions.c source file. The flaw allows a remote attacker to bypass authentication mechanisms by presenting a forged JSON Web Token (JWT) containing an invalid RSA signature, thereby obtaining administrative privileges. The affected product is RDK-B WebUI version rdkb-2025q4-kirkstone.04.10.26. There is no CVSS score or vendor advisory indicating a fix or mitigation, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation results in unauthorized administrative access to the RDK-B WebUI, potentially allowing full control over the affected device or system. This compromises the integrity and security of the system by bypassing authentication controls.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the RDK-B WebUI interface to trusted networks and monitor for suspicious activity related to JWT authentication attempts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- certcc
- Date Reserved
- 2026-08-10T19:13:26.432Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a860605acd9273b49871aa8
Added to database: 08/19/2026, 19:37:41 UTC
Last enriched: 08/19/2026, 19:55:45 UTC
Last updated: 08/19/2026, 19:57:10 UTC
Views: 3
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