What’s Vulnerable › Vulnerabilities

CVE-2026-19505: RDK-B WebUI improper cryptographic signature verification vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-09-03
• Weakness: CWE-347

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.

Affected products

• RDK-B WebUI: rdkb-2025q4-kirkstone

References

• https://developer.rdkcentral.com/documentation/documentation/rdk_broadband_documentation/components/webui/
• https://whitehats.pwr.edu.pl//blog/2026-08-19-multiple-vulnerabilities-in-rdkb/

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