CYBERSIXT Signal Over Noise
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Vulnerability intelligence

CVE-2026-19505

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.

CVSS Score
—
Unrated
EPSS — Exploit Probability
0.2%
Riskier than 9% of all CVEs
Exploitation
Not in CISA KEV
No federal exploitation record
Remediation
unknown
Check vendor advisories
NVD entry PoC / advisory

1 article across 1 outlet · first covered Aug 21, 2026 · latest Aug 21, 2026

Coverage timeline